Watkins, K. W. (1998). Student study guide to accompany Chang chemistry (6th ed.). WCB.
Lua i Stíl Chicago (17ú heag.)Watkins, Kenneth W. Student Study Guide to Accompany Chang Chemistry. 6th ed. Boston: WCB, 1998.
Lua MLA (9ú heag.)Watkins, Kenneth W. Student Study Guide to Accompany Chang Chemistry. 6th ed. WCB, 1998.
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