Cita APA (7th ed.)

Lord, T. R., & Travis, H. J. (2011). Schoolyard science: 101 easy and inexpensive activities. National Science Teachers Association.

Cita Chicago (17th ed.)

Lord, Thomas R., i Holly J. Travis. Schoolyard Science: 101 Easy and Inexpensive Activities. Arlington, Va.: National Science Teachers Association, 2011.

Cita MLA (9th ed.)

Lord, Thomas R., i Holly J. Travis. Schoolyard Science: 101 Easy and Inexpensive Activities. National Science Teachers Association, 2011.