Friede, Juan
Northern Illinois University Press, 1971
Buku Teks
Prio Widiyono
Universitas Indonesia, 1984
UI - Skripsi (Membership)
Artikel Jurnal
Scholten, C.
Amsterdam J Schulman 1951
Buku Teks
Suprashartono Hubertus
Fakultas Teknik Universitas Indonesia, 1994
UI - Skripsi (Membership)