Stewart, Rosemary
Choices for the manager
Prentice-Hall, 1982
 Buku Teks
Webber, Ross A.
To be a manager
Richard D. Irwin, 1981
 Buku Teks
United Nations Population Fund
Choices and responsibilities
UNFPA, 1994
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Mooney, Gavin H.
Choices for health care
MacMillan Press , 1980
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Coulmas, Florian
Sociolinguistics:the study of speakers choices
Cambridge University Press, 2005
 Buku Teks