Powell, L. S. (1969). Communication and learning. Pitman.
Cita Chicago Style (17a ed.)Powell, Leonard Sutherland. Communication and Learning. London: Pitman, 1969.
Cita MLA (8a ed.)Powell, Leonard Sutherland. Communication and Learning. Pitman, 1969.
Precaución: Estas citas no son 100% exactas.