For example, journal citation is [J] journal paper.

For example: Zhang San. On the development of small and medium-sized enterprises [J]. Humanities research. 2005,5(6):52

It's about the author Zhang San, and the topic is the development of small and medium-sized enterprises. This is the periodical document of the Journal of Humanities Studies published in 2005, and it is the sixth issue of the fifth volume of this magazine. This quotation comes from page 52 of the revised journal paper.

If it is quoted from a doctoral thesis, it is [D]

If you quote a book, it is [M], a monograph.

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