Citazione APA

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

Stile di citazione Chicago

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

Citazione MLA

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