APA

Hardy J. D., . (1971). Critical surgical illness. Philadelphia: W.B.Saunders Company.

Chicago

Hardy James D, . 1971. Critical surgical illness. Philadelphia: W.B.Saunders Company.

Harvard

Hardy J. D., . (1971). Critical surgical illness. Philadelphia: W.B.Saunders Company.

MLA

Hardy James D, . Critical surgical illness. Philadelphia: W.B.Saunders Company. 1971.