Cita APA

Keane, E., & Ziegler, O. L. (1950). The Penfold story. [s.n.].

Citación estilo Chicago

Keane, Eve, and Oswald Leopold Ziegler. The Penfold Story. [s.l.]: [s.n.], 1950.

Cita MLA

Keane, Eve, and Oswald Leopold Ziegler. The Penfold Story. [s.n.], 1950.

Warning: These citations may not always be 100% accurate.