Cita APA (7a ed.)

Wittich, W. A. (1953). Audio-visual materials: Their nature and use. Harper and Brothers.

Cita Chicago Style (17a ed.)

Wittich, Walter Arno. Audio-visual Materials: Their Nature and Use. Harper and Brothers, 1953.

Cita MLA (9a ed.)

Wittich, Walter Arno. Audio-visual Materials: Their Nature and Use. Harper and Brothers, 1953.