Artikel Jurnal
[by] William H. Havener [and others]
Mosby , 1979
Buku Teks
Likhachov, A.G.
Foreign language Publ. House, T.t.
Buku Teks
edited by Harold Ludman, Patrick J. Bradley; Aryandhito Widhi Nugroho, translator
EGC, 2012
Buku Teks
Pracy, R., author
Gramedia Pustaka Utama, 1993
Buku Teks