APA

Salk L., . (1979). Dear Dr. Salk. New York: Harper and Row Publishers.

Chicago

Salk Lee, . 1979. Dear Dr. Salk. New York: Harper and Row Publishers.

Harvard

Salk L., . (1979). Dear Dr. Salk. New York: Harper and Row Publishers.

MLA

Salk Lee, . Dear Dr. Salk. New York: Harper and Row Publishers. 1979.