James H. Gary, "Petroleum Refining: Technology, Economics, and Markets, Sixth Edition Ed 6" English | ISBN: 1466563001 | 2019 | 722 pages | PDF | 142 MB
W. David Pierce, "Behavior Analysis and Learning: A Biobehavioral Approach, Sixth Edition Ed 6" English | ISBN: 1138898589 | 2017 | 622 pages | PDF | 41 MB