APA
Dr. D. Clayson, . (1956). Cancer Letters. New York: Academic Press.
Chicago
Dr. D. Clayson, . 1956. Cancer Letters. New York: Academic Press.
Harvard
Dr. D. Clayson, . (1956). Cancer Letters. New York: Academic Press.
MLA
Dr. D. Clayson, . Cancer Letters. New York: Academic Press. 1956.