Office of the Executive Assistant
Gramedia Widiasarana Indonesia, 1995
Buku Referensi
Gramedia Pustaka Utama , 1992
Buku Teks
1994
Buku Teks
Soeharto, author
State Secretariat of the Republic of Indonesia, 1995
Buku Klasik
Edited by A.W. Singham and Tran Van Dinh
Third Press Review Books, 1976
Buku Teks