Elementary Differential Equations by William F. Trench Andrew G. Cowles Distinguished Professor Emeritus, Department of Mathematics, Trinity University, San Antonio, Texas, USA,Previously published by Brooks/Cole Thomson Learning, 2000. This book has been judged to meet the evaluation criteria set by the Editorial Board of the American Institute of Mathematics in connection with the Institute’s Open Textbook Initiative.
William F. Trench
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William F. Trench, “Elementary Diferrential Equantions,” Open Educational Resource (OER) , accessed October 26, 2020, http://oer.iain-padangsidimpuan.ac.id/items/show/141.