APA-referens (7:e uppl.)

Obourn, E. S. (1958). Activities in science: Workbook to accompany science in everyday life (2nd edition.). D. Van Nostrand Co.

Chicago-referens (17:e uppl.)

Obourn, Ellsworth S. Activities in Science: Workbook to Accompany Science in Everyday Life. 2nd edition. Princeton, New Jersey: D. Van Nostrand Co, 1958.

MLA-referens (9:e uppl.)

Obourn, Ellsworth S. Activities in Science: Workbook to Accompany Science in Everyday Life. 2nd edition. D. Van Nostrand Co, 1958.