APA (7th ed.) Citation

Lewis, J., & Davis, H. (1982). The Usborne pocket calculator book. Usborne.

Chicago Style (17th ed.) Citation

Lewis, John, and Helen Davis. The Usborne Pocket Calculator Book. London: Usborne, 1982.

MLA (9th ed.) Citation

Lewis, John, and Helen Davis. The Usborne Pocket Calculator Book. Usborne, 1982.

Warning: These citations may not always be 100% accurate.