APA (7th ed.) Citation

Bidwell, S. (1977). The Encyclopedia of land warfare in the 20th century. Spring Books.

Chicago Style (17th ed.) Citation

Bidwell, Shelford. The Encyclopedia of Land Warfare in the 20th Century. London: Spring Books, 1977.

MLA (9th ed.) Citation

Bidwell, Shelford. The Encyclopedia of Land Warfare in the 20th Century. Spring Books, 1977.