Cita APA (7a ed.)

Illinois. University. School Science Curriculum Project. (1966). The short inetrval timer. National Science Foundation.

Cita Chicago Style (17a ed.)

Illinois. University. School Science Curriculum Project. The Short Inetrval Timer. Washington, D.C: National Science Foundation, 1966.

Cita MLA (9a ed.)

Illinois. University. School Science Curriculum Project. The Short Inetrval Timer. National Science Foundation, 1966.