GUENTHER, E. Minyak atsiri jilid IV A. UI Press.
Lua i Stíl Chicago (17ú heag.)GUENTHER, ERNEST. Minyak Atsiri Jilid IV A. UI Press.
Lua MLA (8ú heag.)GUENTHER, ERNEST. Minyak Atsiri Jilid IV A. UI Press.
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