Cita APA (7a ed.)

Heath Company. (1959). Operational Manual for the Heath Educational Analog Computer: Model EC-1. s.e..

Cita Chicago Style (17a ed.)

Heath Company. Operational Manual for the Heath Educational Analog Computer: Model EC-1. s.l.: s.e., 1959.

Cita MLA (9a ed.)

Heath Company. Operational Manual for the Heath Educational Analog Computer: Model EC-1. s.e., 1959.