Sturgis, Alice F.
McGraw-Hill, 1950
Buku Teks
Sturgis,Alice F
McGraw-Hill Book Company,INC, 1953
Buku Teks
Faisal Djamal, author
UNDP, 2009
Buku Referensi
Muhammad Ridhwan Indra, author
Haji Masagung, 1988
Buku Teks
Frederick A. Fraeger, 1954
Buku Teks