Whitehead, C. (1994). So, what is assertivenessn: An assertiveness training course. Resource Publications.
Citace podle Chicago (17th ed.)Whitehead, Chrissie. So, What Is Assertivenessn: An Assertiveness Training Course. San Jose, Calif: Resource Publications, 1994.
Citace podle MLA (9th ed.)Whitehead, Chrissie. So, What Is Assertivenessn: An Assertiveness Training Course. Resource Publications, 1994.
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