Victoria : Brown Prior Anderson
Majalah, Jurnal, Buletin
The McGraw-Hill Companies, {s.a}
Majalah, Jurnal, Buletin
McGraw-Hill,
Majalah, Jurnal, Buletin
Subbiah, Rama
Kuala Lumpur T.p.] 1967
Buku Teks
Koehler, Robert, author
Seoul Selection, 2009
Buku Referensi