APA

Zimmermann de Mergel M., . (1974). Communication for business. Río Piedras, P. R: University of Puerto Rico Press.

Chicago

Zimmermann de Mergel Margaret, . 1974. Communication for business. Río Piedras, P. R: University of Puerto Rico Press.

Harvard

Zimmermann de Mergel M., . (1974). Communication for business. Río Piedras, P. R: University of Puerto Rico Press.

MLA

Zimmermann de Mergel Margaret, . Communication for business. Río Piedras, P. R: University of Puerto Rico Press. 1974.