Παραπομπή APA

Earl , B., & Wilford L . D . R. (1998). Revision for chemistry GCSE with answers. John murray publishers.

Παραπομπή Chicago Style

Earl , B., και Wilford L . D . R. Revision for Chemistry GCSE with Answers. London: John murray publishers, 1998.

Παραπομπή MLA

Earl , B., και Wilford L . D . R. Revision for Chemistry GCSE with Answers. John murray publishers, 1998.