APA (7th ed.) Citation

Polo, M. (1958). The customs of the kingdoms of India. Penguin Books.

Chicago Style (17th ed.) Citation

Polo, Marco. The Customs of the Kingdoms of India. London: Penguin Books, 1958.

MLA (9th ed.) Citation

Polo, Marco. The Customs of the Kingdoms of India. Penguin Books, 1958.

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