Cita APA (7a ed.)

Betz, F., & Holzwarth, C. H. (1933). A second German book. American book company.

Cita Chicago Style (17a ed.)

Betz, Frederick, y Charles Homer Holzwarth. A Second German Book. New York: American book company, 1933.

Cita MLA (9a ed.)

Betz, Frederick, y Charles Homer Holzwarth. A Second German Book. American book company, 1933.