APA
John Hopkins medical letter health after 50, . (1992). The Johns Hopkins medical handbook. New York: Random House.
Chicago
John Hopkins medical letter health after 50, . 1992. The Johns Hopkins medical handbook. New York: Random House.
Harvard
John Hopkins medical letter health after 50, . (1992). The Johns Hopkins medical handbook. New York: Random House.
MLA
John Hopkins medical letter health after 50, . The Johns Hopkins medical handbook. New York: Random House. 1992.