“Taoist Thunder Magic Traditions and Their Relationship to Nei Kung Meditation” by Shifu Lin
"This work from Shifu Lin describes the scholarly theories about the origins of "Thunder Magic" Tao Jiao Lei Fa, as well as what Taoism itself says about the descent of the practice from the gods to human beings.
While the book is not instructional in nature, it does discuss the foundational levels of Nei Kung of the Mo Pai tradition in relation to other well-known "Thunder Magic" paths, and how such inner cultivation became a necessary prerequisite to "power up" the Lei Fa practices, which otherwise, the Taoist sources on "Thunder Magic" tell us, will not produce results.
Shifu Lin also argues compelling that in this regard, advanced Mo Pai is not so different from other lineages of Lei Fa "Thunder Magic," and that the foundational levels of Nei Kung of the Mo Pai Lei Fa tradition is actually to make the later Lei Fa-based levels "work."
Quit simply, there is no other work that covers as much detail, in English, and with a discussion from an academic perspective as well as that of someone who has studied various Lei Fa traditions first hand, through direct instruction."
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