APA (7th ed.) Citation

Heys, H. (1960). An introduction to electronic theory of organic compounds. George G. Harrap.

Chicago Style (17th ed.) Citation

Heys, H.L. An Introduction to Electronic Theory of Organic Compounds. London: George G. Harrap, 1960.

MLA (9th ed.) Citation

Heys, H.L. An Introduction to Electronic Theory of Organic Compounds. George G. Harrap, 1960.