Cita APA (7a ed.)

Willoughby, E. E. (1947). Fifty printers' marks. Book Arts Club, Univ. of California.

Cita Chicago Style (17a ed.)

Willoughby, Edwin Eliott. Fifty Printers' Marks. Berkeley: Book Arts Club, Univ. of California, 1947.

Cita MLA (8a ed.)

Willoughby, Edwin Eliott. Fifty Printers' Marks. Book Arts Club, Univ. of California, 1947.

Precaución: Estas citas no son 100% exactas.