Cita APA (7th ed.)
Biblioteca interamericana. Doubleday, Page and Company.
Cita Chicago (17th ed.)
Biblioteca Interamericana. Nueva York: Doubleday, Page and Company.
Cita MLA (9th ed.)
Biblioteca Interamericana. Doubleday, Page and Company.
Atenció: Aquestes cites poden no estar 100% correctes.