APA (7th ed.) Citation

St. George, J. (1992). Dear Dr. Bell-- your friend, Helen Keller. Putnam's Sons.

Chicago Style (17th ed.) Citation

St. George, Judith. Dear Dr. Bell-- Your Friend, Helen Keller. New York: Putnam's Sons, 1992.

MLA (8th ed.) Citation

St. George, Judith. Dear Dr. Bell-- Your Friend, Helen Keller. Putnam's Sons, 1992.

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