Fakultas Ilmu Pengetahuan dan Budaya Universitas Indonesia, 1980
UI - Skripsi (Membership)
Barbu,Tudor, author
Springer Cham, 2019
eBooks
Helga Stan-Lotter
Springer, 2012
eBooks
Singh, Nagendra Kumar
Stevens & Sons, 1984
Buku Teks
Singh, Kirpal
University Education Press , 1986
Buku Teks