APA
Boyd W. &. S. . H. ., . (1980). Introduction to the study & disease 8th ed. : .
Chicago
Boyd William & Sheldon H, . 1980. Introduction to the study & disease 8th ed. : .
Harvard
Boyd W. &. S. . H. ., . (1980). Introduction to the study & disease 8th ed. : .
MLA
Boyd William & Sheldon H, . Introduction to the study & disease 8th ed. : . 1980.