APA
Dr. D. Clayson, . (1997). Cancer Letters. New York: Elsevier.
Chicago
Dr. D. Clayson, . 1997. Cancer Letters. New York: Elsevier.
Harvard
Dr. D. Clayson, . (1997). Cancer Letters. New York: Elsevier.
MLA
Dr. D. Clayson, . Cancer Letters. New York: Elsevier. 1997.