APA

Tornos A. d., . (1892). A key to the exercises in the combined spanish method, a new practical and theoretical system of learning the castellan language. New York: D. Appleton and company.

Chicago

Tornos Alberto de, . 1892. A key to the exercises in the combined spanish method, a new practical and theoretical system of learning the castellan language. New York: D. Appleton and company.

Harvard

Tornos A. d., . (1892). A key to the exercises in the combined spanish method, a new practical and theoretical system of learning the castellan language. New York: D. Appleton and company.

MLA

Tornos Alberto de, . A key to the exercises in the combined spanish method, a new practical and theoretical system of learning the castellan language. New York: D. Appleton and company. 1892.