1. Abels, D. & J. Kattan-Byron, 1989. Psoriasis natural treatment at the Dead Sea: A natural selective ultraviolet phototherapy. Natural Therapy at the Dead Sea. Unpublished Report by the Dead Sea Regional Tourist Organization, 15 pp.
2. Abraham, H., 1960. Asphalts and allied substances. Volume 1. Van Nostrand, Princeton, N. J.
3. Aizenshtat, Z., & D. Aschengrau, 1990. Analyses of oil contained in Herodian juglet from Qumran (Israel). Israel Exploration J. 39: 55?59.
4. Almog, Y. & B.-Z. Eshel, 1957. The Dead Sea Region. Am. Oved. Pub., Tel Aviv. (in Hebrew).
5. Amit, O. & A. Bein, 1979, The genesis of asphalts in the Dead Sea area. J. Geochem. Expl. 11: 211?225.