APA

Bull W. E., . (1965). Spanish for teachers: applied linguistics. New York: Ronald Press Co.

Chicago

Bull William Emerson, . 1965. Spanish for teachers: applied linguistics. New York: Ronald Press Co.

Harvard

Bull W. E., . (1965). Spanish for teachers: applied linguistics. New York: Ronald Press Co.

MLA

Bull William Emerson, . Spanish for teachers: applied linguistics. New York: Ronald Press Co. 1965.