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- Edwards, David A.; Hastings, Harold M. (1980), "Čech theory: its past, present, and future", The Rocky Mountain Journal of Mathematics 10 (3): 429–468, doi:10.1216/RMJ-1980-10-3-429, MR 590209.
- Edwards, David A.; Hastings, Harold M. (1976), Čech and Steenrod homotopy theories with applications to geometric topology, Lecture Notes in Mathematics, Vol. 542, Springer-Verlag, Berlin-New York, MR 0428322.
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