APA (7e ed.) Bronvermelding

Bethke, E. G. (1969). Basic drawing for biology students. Charles C. Thomas.

Chicago (17e ed.) Bronvermelding

Bethke, Emil G. Basic Drawing for Biology Students. Springfield, IL: Charles C. Thomas, 1969.

MLA (9e ed.) Bronvermelding

Bethke, Emil G. Basic Drawing for Biology Students. Charles C. Thomas, 1969.