MLA

Haldeman-Julius, E. (Emanuel), 1888-1951, Randolph, Vance, 1892-1980. Little blue book. c1925. https://collections.library.yale.edu/catalog/10840905.

APA, 6th edition

Haldeman-Julius, E. (Emanuel), 1888-1951, & Randolph, Vance, 1892-1980. (c1925)[Little blue book]. https://collections.library.yale.edu/catalog/10840905.