Artikel Jurnal
Viera, Walter E.
Pustaka Binaman Pressindo, 1990
Buku Teks
Christine S.T. Kansil, author
Sinar Grafika, 1995
Buku Teks
Artikel Jurnal
Khavronina, Serafima Alekseyevna, author
Progress Publisher, [date of publication not identified]
Buku Teks