Citazione Stile APA (7a Edizione)

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

Citazione stile Chigago Style (17a edizione)

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

Citatione MLA (9a ed.)

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