Irwan, 1985
Buku Teks
Knudson, Harry R., editor
Mass. Addison-Wesley , 1967
Buku Teks
Institute of Southeast Asian studies, 1991
Buku Teks
Muhammad Rifky Santoso
BPPK Kementerian Keuangan, 2019
Artikel Jurnal
De Cenzo, David A.
John Wiley & Sons, 2002
Buku Teks