Sarah, author
2016
UI - Makalah dan Kertas Kerja
Ritonga, Kobul Syahrin, author
Program Pascasarjana Universitas Indonesia, 2011
UI - Tesis (Open)
Apple, James M. (James MacGregor), 1915-1978, author
John Wiley & Sons, 1977
Buku Teks
Rudenko, N. (Nikolail), author
Mir Publishers , 1964
Buku Teks
Heaslip, George B., author
John Wiley & Sons, 1975
Buku Teks