APA (7th ed.) Citation

"Thomas, H. (1989). An unfinished history of the world. Pan books publishers.

Chicago Style (17th ed.) Citation

"Thomas, Hugh". An Unfinished History of the World. Pan books publishers, 1989.

MLA (9th ed.) Citation

"Thomas, Hugh". An Unfinished History of the World. Pan books publishers, 1989.

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