Cita APA (7a ed.)

Ledermann, A., & Trachsel, A. (1959). Playgrounds and recreation spaces. The architectural press.

Cita Chicago Style (17a ed.)

Ledermann, Alfred, y Alfred Trachsel. Playgrounds and Recreation Spaces. London: The architectural press, 1959.

Cita MLA (9a ed.)

Ledermann, Alfred, y Alfred Trachsel. Playgrounds and Recreation Spaces. The architectural press, 1959.