APA

Lugton R. C., . (1978). American tropics a reading-vocabulary text for speakers of English as a second languaje. Englewood Cliffs (Nueva Jersey, Estados Unidos): Prentice-Hallc1978.

Chicago

Lugton Robert C, . 1978. American tropics a reading-vocabulary text for speakers of English as a second languaje. Englewood Cliffs (Nueva Jersey, Estados Unidos): Prentice-Hallc1978.

Harvard

Lugton R. C., . (1978). American tropics a reading-vocabulary text for speakers of English as a second languaje. Englewood Cliffs (Nueva Jersey, Estados Unidos): Prentice-Hallc1978.

MLA

Lugton Robert C, . American tropics a reading-vocabulary text for speakers of English as a second languaje. Englewood Cliffs (Nueva Jersey, Estados Unidos): Prentice-Hallc1978. 1978.