Citazione Stile APA (7a Edizione)

Petzoldt, P., & Petzoldt, P. (1954). On top of the world: My adventures with my mountain climbing husband (1a. ed.). Collins clear type press.

Citazione stile Chigago Style (17a edizione)

Petzoldt, Patricia, e Paul Petzoldt. On top of the World: My Adventures with My Mountain Climbing Husband. 1a. ed. Londres: Collins clear type press, 1954.

Citatione MLA (9a ed.)

Petzoldt, Patricia, e Paul Petzoldt. On top of the World: My Adventures with My Mountain Climbing Husband. 1a. ed. Collins clear type press, 1954.