Cita APA (7th ed.)

Bull, W. E. (1968). Time, tense, and the verb: A study in theoretical and applied linguistics, with particular attention to spanish (1a. ed.). University of California.

Cita Chicago (17th ed.)

Bull, William E. Time, Tense, and the Verb: A Study in Theoretical and Applied Linguistics, with Particular Attention to Spanish. 1a. ed. Berkeley: University of California, 1968.

Cita MLA (9th ed.)

Bull, William E. Time, Tense, and the Verb: A Study in Theoretical and Applied Linguistics, with Particular Attention to Spanish. 1a. ed. University of California, 1968.