Jones, Edward
Osborne McGraw-Hill , 1990
Buku Teks SO
Jones, Edward
Osborne McGraw-Hill, 1985
Buku Teks SO
Byers, Robert A.
Ashton-Tate, 1982
Buku Teks SO
Farida Prabowo
Fakultas Ilmu Pengetahuan Budaya Universitas Indonesia, 1987
UI - Skripsi Membership
edited by Lynne Hayman
CT Meckler, 1990
Buku Teks SO