APA (7th ed.) Citation

Southwest Educational Development Laboratory & Higginson, G. M. (1969). Calipers: Planning the systems approach to field testing educational products. Southwest Educational Development Laboratory.

Chicago Style (17th ed.) Citation

Southwest Educational Development Laboratory and George M. Higginson. Calipers: Planning the Systems Approach to Field Testing Educational Products. Austin, Tex.: Southwest Educational Development Laboratory, 1969.

MLA (9th ed.) Citation

Southwest Educational Development Laboratory and George M. Higginson. Calipers: Planning the Systems Approach to Field Testing Educational Products. Southwest Educational Development Laboratory, 1969.