APA (7th ed.) Citation

Martin Leon Keen. (1972). The how and why wonder book of Chemistry. Transworld.

Chicago Style (17th ed.) Citation

Martin Leon Keen. The How and Why Wonder Book of Chemistry. London: Transworld, 1972.

MLA (9th ed.) Citation

Martin Leon Keen. The How and Why Wonder Book of Chemistry. Transworld, 1972.

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