APA (7th ed.) Citation

Boxer, C. R. (1973). The Portuguese seaborne empire / by C.R. Boxer. Penguin.

Chicago Style (17th ed.) Citation

Boxer, C. R. The Portuguese Seaborne Empire / by C.R. Boxer. Penguin, 1973.

MLA (9th ed.) Citation

Boxer, C. R. The Portuguese Seaborne Empire / by C.R. Boxer. Penguin, 1973.

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