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Hidayat, Sutanto and Alit, A. A. Sagung (1999) Kajian faktor angka konversi kekuatan tekan beton berdasarkan SK.SNI.T 15 1991-03 pada beton normal (FC'=40 MPA) dengan perawatan moist curing. Technical Report. ITN Malang, Malang. (Unpublished)
Boyd, Richard and Gasper, Philip and Trout, J.D. (1999) The Philosophy of Science. Seventh printing. ISBN 0-262-52156-3
Tuckman, Bruce W. (1999) Conducting Educational Research Fifth Edition. The Ohio State University, New York. ISBN O-15-505477-5