APA (7th ed.) Citation

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

Chicago Style (17th ed.) Citation

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

MLA (9th ed.) Citation

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