APA
Tristram Engelhardt H., Callahan D., . (1976). The ROOTS of ethics. New York: Plenum Press.
Chicago
Tristram Engelhardt H, Callahan Daniel, . 1976. The ROOTS of ethics. New York: Plenum Press.
Harvard
Tristram Engelhardt H., Callahan D., . (1976). The ROOTS of ethics. New York: Plenum Press.
MLA
Tristram Engelhardt H, Callahan Daniel, . The ROOTS of ethics. New York: Plenum Press. 1976.