Cita APA (7th ed.)

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

Cita Chicago (17th ed.)

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

Cita MLA (9th ed.)

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