Cita APA (7th ed.)

Mathsoft, Inc. (1998). Mathcad 3.1: User's guide. MathSoft.

Cita Chicago (17th ed.)

Mathsoft, Inc. Mathcad 3.1: User's Guide. Cambridge, Mass., USA: MathSoft, 1998.

Cita MLA (9th ed.)

Mathsoft, Inc. Mathcad 3.1: User's Guide. MathSoft, 1998.