Ikha Muliawati, author
2011
UI - Skripsi (Open)
Davenport, S.J.
Washington, DC: United States Department of the Interior, 1954
Buku Teks
Sugihardjo, author
Yogyakarta: Usaha Teknik Soemitro, 1969
Buku Teks
Paul L. Magill, Francis R. Holden, Charles Ackley, editor; Frederick G. Sawyer, editorial consultant
McGraw-Hill, 1956
Buku Referensi
Artikel Jurnal