Trager, Frank N.
Frederick A. Preager, 1966
Buku Teks
Youngseon Jo
Elex Media Komputindo, 2013
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Cho, Youngsun
Elex Media Komputindo, 2019
Buku Teks SO
Ross, Alf
Harvard University Press, 1952
Buku Teks SO
Jo, Youngsun
Gramedia, 2013
Buku Teks SO