MLA

Riker, William E. The Diamond Key Book : in Revelation Form : Carefully Study, Read and Re-Read Each Revelation within This Book ... P.C.D.W., 0AD. https://collections.library.yale.edu/catalog/31912834.

APA, 6th edition

Riker, W. E. (0 C.E.). The diamond key book : in revelation form : carefully study, read and re-read each revelation within this book ... [Controversial literature, White supremacist literature California San Francisco 1910]. P.C.D.W. https://collections.library.yale.edu/catalog/31912834.