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Buku Referensi
M. Sabir
Pustaka sinar Harapan, 1992
Buku Teks
Gill, Ranjit
Gramedia, 1988
Buku Teks
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Buku Referensi
C.P.F Luhulima ... [et al.]
Sekretariat Nasional ASEAN, 1994
Buku Teks