Cita APA (7a ed.)

Olsen, P. U. (1960). Historie (2. opl.). Busck.

Cita Chicago Style (17a ed.)

Olsen, Peter Ussing. Historie. 2. opl. [København]: Busck, 1960.

Cita MLA (9a ed.)

Olsen, Peter Ussing. Historie. 2. opl. Busck, 1960.