El-Etr, H., Moustafa, A. R., and El-Baz, Farouk. 1979. "Photolineaments in the ASTP Stereostrip of the Western Desert of Egypt." in Apollo-Soyuz Test Project Summary Science Report. Volume II: Earth Observations and Photography, NASA SP-412, edited by El-Baz, Farouk and Warner, Delia M., 97–105. Washington, D.C.: NASA Scientific and Technical Information Branch.