MLA

Fraternity, Omega Psi Phi. The Omega Bulletin. Omega Psi Phi Fraternity, 1931. https://collections.library.yale.edu/catalog/2044493.

APA, 6th edition

Fraternity, O. P. P. (1931). The Omega bulletin [Broadsides, Newspapers, Periodicals]. Omega Psi Phi Fraternity. https://collections.library.yale.edu/catalog/2044493.