Chemical investigations for changing times
by Lawrence W. Scott [and others]
Burgess, 1976
 Buku Teks
Companion, Audrey L.
chemical bonding / Audrey L. Companion
McGraw-Hill, 1979
 Buku Teks
Vanida Chairgulprasert
Removal of free fatty acid from used palm oil by coffee husk ash / Vanida Chairgulprasert, Porntip Madlah
Thammasat University, 2018
 Artikel Jurnal
Hougen, Olaf A.
Chemical process principles part 1 : material and energy balances/ Olaf A. Hougen, Kenneth M. Watson, Roland A. Ragatz
John Wiley & Sons, 1943
 Buku Teks
Ludwig, Ernest E.
Applied process design for chemical and petrochemical plants. Volume 1 / Ernest E. Ludwig
Gulf Publishing Company, 1964
 Buku Teks