Gaya APA

Holten, C., Judith, I, M. (1998). Looking ahead 4: mastering academic writing . New York: New York: Heinle & Heinle, 1998.

Gaya MLA

Holten, Christine., Judith, I., Marasco,. "Looking ahead 4: mastering academic writing". New York: New York: Heinle & Heinle, 1998, 1998. .