APA (7th ed.) Citation

Holt, T., & Holt, V. (1998). Battlefields of the First World War: A traveller's guide. Parkgate Books.

Chicago Style (17th ed.) Citation

Holt, Tonie, and Valmai Holt. Battlefields of the First World War: A Traveller's Guide. London: Parkgate Books, 1998.

MLA (9th ed.) Citation

Holt, Tonie, and Valmai Holt. Battlefields of the First World War: A Traveller's Guide. Parkgate Books, 1998.