Cita APA (7th ed.)
The doubleday pictorial library. Doubleday.
Cita Chicago (17th ed.)
The Doubleday Pictorial Library. New York: Doubleday.
Cita MLA (9th ed.)
The Doubleday Pictorial Library. Doubleday.
Atenció: Aquestes cites poden no estar 100% correctes.