R.M. Moerdowo, author
Yogyakarta: Kanisius, 1973,
Buku Referensi
Andrea Acri, author
Kepustakaan Populer Gramedia, 2021
Buku Teks
translated and edited by R.C. Zaehner
J.M. Dent & Sons, 1966
Buku Teks
Abdul Kalam, A.P.J.
Ocean Books, 2005
Buku Teks
Herman, A. L., author
Westview Press, 1991
Buku Referensi