Gaya APA
Skill With People. (2001).
Jakarta:
PT. Gramedia Pustaka Utama.
Gaya Chicago
Skill With People.
.
Jakarta:
PT. Gramedia Pustaka Utama,
2001.
Text.
Gaya MLA
Skill With People.
.
Jakarta:
PT. Gramedia Pustaka Utama,
2001.
Text.
Gaya Turabian
Skill With People.
Jakarta:
PT. Gramedia Pustaka Utama,
2001.
Print.