APA
John R. Heller, . (1949). Journal of the National Cancer Institute. U.S.A: The National Cancer Institute.
Chicago
John R. Heller, . 1949. Journal of the National Cancer Institute. U.S.A: The National Cancer Institute.
Harvard
John R. Heller, . (1949). Journal of the National Cancer Institute. U.S.A: The National Cancer Institute.
MLA
John R. Heller, . Journal of the National Cancer Institute. U.S.A: The National Cancer Institute. 1949.