Cita APA (7a ed.)

Henderson Hay, S. (1966). A Footing on this Earth. Doubleday.

Cita Chicago Style (17a ed.)

Henderson Hay, Sara. A Footing on This Earth. New York, Estados Unidos: Doubleday, 1966.

Cita MLA (9a ed.)

Henderson Hay, Sara. A Footing on This Earth. Doubleday, 1966.