Cita APA (7a ed.)

Shippen, K. B. (1951). Leif Eriksson, first voyager to America. Harper & Brothers.

Cita Chicago Style (17a ed.)

Shippen, Katherine B. Leif Eriksson, First Voyager to America. New York: Harper & Brothers, 1951.

Cita MLA (9a ed.)

Shippen, Katherine B. Leif Eriksson, First Voyager to America. Harper & Brothers, 1951.