APA (7th ed.) Citation

(1976). Purnell's encyclopaedia of inventions. Purnell Books.

Chicago Style (17th ed.) Citation

Purnell's Encyclopaedia of Inventions. Purnell Books, 1976.

MLA (9th ed.) Citation

Purnell's Encyclopaedia of Inventions. Purnell Books, 1976.

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