Gaya APA

puturuhu, F., altman, H, B. (1987). English for specific purposes: a learning-centred approach (Cetakan 8). New York: Cambridge University Press.

Gaya MLA

puturuhu, Ferad., altman, Howard, B.. "English for specific purposes: a learning-centred approach". Cetakan 8 New York: Cambridge University Press, 1987. Text.