http://www.skepdic.com/myersb.html
http://www.psychometric-success.com/personality-tests/person...
"Overall, the review committee concluded that the MBTI has not demonstrated adequate validity although its popularity and use has been steadily increasing. The National Academy of Sciences review committee concluded that: 'at this time, there is not sufficient, well-designed research to justify the use of the MBTI in career counseling programs,' the very thing that it is most often used for."
http://www.indiana.edu/~jobtalk/HRMWebsite/hrm/articles/deve...
http://www.amazon.com/Cult-Personality-Testing-Annie-Murphy/...
http://www.washingtonpost.com/national/on-leadership/myers-b...
"Now, 50 years after the first time anyone paid money for the test, the Myers-Briggs legacy is reaching the end of the family line. The youngest heirs don’t want it. And it’s not clear whether organizations should, either.
. . . .
"Yet despite its widespread use and vast financial success, and although it was derived from the work of Carl Jung, one of the most famous psychologists of the 20th century, the test is highly questioned by the scientific community."
It seems like the more appropriate question when discussing these frameworks might be whether they are useful. Many people find the MBTI framework a useful way to think about themselves. Just like many people find GTD useful for being organized, or Paleo useful for choosing what to eat, or Agile useful for coordinating software development, or [system/lens/framework here] useful for [thing that people do], even though they are not demonstrably "correct" (or even superior to competing systems).
Correct and useful aren't necessarily the same thing, especially when we're discussing systems that are more of a descriptive worldview than an actual set of predictions.
The Big 5 is the current standard, and the four MBTI dimensions correlate to 4 of the Big 5. E/I is Extraversion in Big 5, N/S is Openness to Experience, and the other two are less orthogonal, but generally T/F is Agreeableness and J/P is Conscientiousness. Neuroticism in Big 5 is essentially not measured in MBTI and doesn't correlate well with any of the MBTI traits.
I did not see any peer reviewed journal articles by him on personality in a Google Scholar author search for his name, only books and a single conference paper.
Finally, looking at the most recent CV I saw -- http://www.darionardi.com/webcv.html -- only one of the papers in the "personality" section is actually from a journal, and it is, lo and behold, a Type-centric journal. And half of the conference papers are for the Association for Psychological Type International.
As appeals to authority go, he is a poor one.
An important part of INTJ maturity is accepting that their own approach may fall short and examining the basis of other beliefs regarding the system or framework they instinctively favor. Or just learning why the lack of adherence to such a framework might be acceptable. INTJs, for example, are urged to learn about different personality preferences so they don't grow impatient with just about every other type. It's easy for INTJs to wonder why their ENFP friend just won't act logically.
In the case of the INTJ, the role of extraverted thinking, commonly called systems thinking, is crucial: It can replace their instinctive (and at times compulsive or otherwise destructive) emotional response to circumstances that make them feel anxiety. So when a more mature INTJ is feeling anxious about a situation or circumstance, they usually fall back on their extraverted thinking to help them examine rationally and build a model around it. Otherwise they might find themselves falling into compulsive behaviors, losing their grip on the situation.