Blanchard, Wendell
Buku Teks
Reed, Sherwood C., author
McGraw-Hill, 1988
Buku Teks
Chandrappa, Ramesha , author
Springer, 2012
eBooks
Agnes Fitria Widyanto, author
Universitas Indonesia, 2019
Artikel Jurnal
Garbutt, John, author
John Wiley & Sons, 1995
Buku Referensi