editor, Made W. Wiratma
International Development Program of Australian Universities and Colleges : Australian Education Centre, [date of publication not identified]
Buku Referensi
World Express Mapping Sdn. Bhd, [date of publication not identified]
Buku Referensi
World Express Mapping Sdn. Bhd, [date of publication not identified]
Buku Referensi
Austin, A.G.
Isac Pitman and Sons, 1965
Buku Teks
tim penyusun, Wens Tanlain [and others]
Gramedia, 1992
Buku Teks