- The Portuguese Empire: A Brief History (Greenwood Publishing Group, 2010)
- New Peoples, New Languages: The Formation and Development of Ethnic Groups in the Americas, 1492-1825 (Greenwood Publishing Group, 1995)
- The Azores: A History of the Portuguese Islands (Scarecrow Press, 1993)
- Madeira: A History of the Portuguese Islands (Scarecrow Press, 1993)
- The Portuguese Atlantic: From the Twelfth to the Seventeenth Centuries (Rowman & Littlefield Publishers, 2016)
- The Portuguese Presence in the Atlantic: From the Beginnings to the Eighteenth Century (Ashgate Publishing, 2008)
- Portuguese Commerce, Society, and the Atlantic, 1490-1830 (Cambridge University Press, 2007)
- Portuguese and American: The Political, Social, and Cultural Relations Between the United States and Portugal (Scarecrow Press, 1996)
- Portuguese Explorers: The Age of Discovery (ABDO Publishing Company, 2009)