APA

Sykes M., . (1981). Aspects of gastroenterology for nurses. London: Pitman Books.

Chicago

Sykes Mary, . 1981. Aspects of gastroenterology for nurses. London: Pitman Books.

Harvard

Sykes M., . (1981). Aspects of gastroenterology for nurses. London: Pitman Books.

MLA

Sykes Mary, . Aspects of gastroenterology for nurses. London: Pitman Books. 1981.