Ceserani, Gian Poolo. Christopher Columbus. New York: Piero Venture, 1978.

Duncan, Alice Smith. Sir Francis Drake and the Struggle for a Ocean Empire. New York: Chersea House Publishers, 1989.

Gibson, Charles. "De Soto." World Book Encyclopedia. Chicago: World Book-Childcraft International, 1982.

Grant, Matthew G. De Soto Explorer of the Southwest. Minnesota: Gallery of Great Americans, 1974.

Grossk, Joyce and Elizabeth Attwood. Great Explorer. Grand Rapids: Gateway Press Inc., 1982.

Hardcastle, David P. "Marquette, Jacques." World Book Encyclopedia. Chicago: World Book-Childcraft International, 1982.

Kielgaro. The Expeditions of Pere Marquette. New York: Rainbow House, 1951

Langer, Williams L. Sir Francics Drake. Boston: Houghton Mifflin Company, 1968.

Snow, Vernon F. "Sir Francics Drake." World Book Encyclopedia. Chicago: World Book-Childcraft International, 1982.

Syme, Ronald. De Soto Finder of the Mississippi. New York : Morrow Junior Books, 1957.