Cita APA (7th ed.)

Marshak, S., & Prothero, D. Portrait of a Planet: Stephen Marshak. c2001.

Cita Chicago (17th ed.)

Marshak, Stephen, i Donald Prothero. Portrait of a Planet: Stephen Marshak. W. W. Norton & Company: c2001.

Cita MLA (9th ed.)

Marshak, Stephen, i Donald Prothero. Portrait of a Planet: Stephen Marshak. c2001.