APA استشهاد

Allen S C. (1998). Medicine in old age (4th.). Churchil Livingston.

استشهاد بنمط شيكاغو

Allen S C. Medicine in Old Age. 4th. Edinburgh: Churchil Livingston, 1998.

MLA استشهاد

Allen S C. Medicine in Old Age. 4th. Churchil Livingston, 1998.