Cita APA (7a ed.)

Hasenohr, C., & Drobner, G. (1907). Ex = Libris Gustav Drobner.

Cita Chicago Style (17a ed.)

Hasenohr, Curt, y Gustav Drobner. Ex = Libris Gustav Drobner. [S.l, 1907.

Cita MLA (9a ed.)

Hasenohr, Curt, y Gustav Drobner. Ex = Libris Gustav Drobner. 1907.