Franklin

MLA

Dahl, Östen. Tense and Aspect Systems. New York, N.Y.: B. Blackwell, 1985.

APA

Dahl, O. (1985). Tense and aspect systems. New York, N.Y.: B. Blackwell.

Chicago

Dahl, Östen. Tense and Aspect Systems. New York, N.Y.: B. Blackwell, 1985.