Petit, CH, author
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Buku Referensi
New York Funk and Wagnalls Company 1955
Buku Referensi
Harahap, P.R.
Jakarta Praninta Aksara [date of publication not identified],
Buku Teks
New York Funk and Wagnalls 1958
Buku Referensi
Singapura Intellectual Puclishing [t.th.]
Buku Referensi