APA aipamena

Barker, A., & Knapp, K. (1990). Chemistry GCSE (Ed.3 /.).

Chicago Style aipamena

Barker, Alan, and Kathryn Knapp. Chemistry GCSE. Ed.3 /. London : Macmillan, 1990.

MLA aipamena

Barker, Alan, and Kathryn Knapp. Chemistry GCSE. Ed.3 /. 1990.