Citazione Stile APA (7a Edizione)

Bond, O. F. 1. . . . e., & Castillo, C. 1. . . . e. (1949). Graded Spanish readers. Alternate series. Books 1. Heath.

Citazione stile Chigago Style (17a edizione)

Bond, Otto Ferdinand 1885- ed, e Carlos 1890- ed Castillo. Graded Spanish Readers. Alternate Series. Books 1. Boston: Heath, 1949.

Citatione MLA (9a ed.)

Bond, Otto Ferdinand 1885- ed, e Carlos 1890- ed Castillo. Graded Spanish Readers. Alternate Series. Books 1. Heath, 1949.