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V. K. A. M. Gugenheim, On twisted tensor products of algebras (mimeographed), Johns Hopkins Univ., Baltimore, Md., 1960.

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Arunas Liulevicius, Multicomplexes and a general change of rings theorem (mimeographed, Chicago, 1967).

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Saunders Mac Lane, Homology, Die Grundlehren der math. Wissenschaften, Band 114, Academic Press, New York and Springer-Verlag, Berlin, 1963. MR 28 #122.

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J. F. Adams, On the non-existence of elements of Hopf invariant one, Ann. of Math. (2) 72 (1960), 20-104. MR 25 #4530. MR 0141119 (25:4530)

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J. Milnor and J. C. Moore, On the structure of Hopf algebras, Ann. of Math. (2) 81 (1965), 211-264. MR 30 #4259. MR 0174052 (30:4259)

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J. P. May, Thesis, Princeton Univ., Princeton, N. J., 1964.

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H. Cartan, Sur l'itération des opérations de Steenrod, Comment Math. Helv. 29 (1955), 40-58. MR 16, 847. MR 0068219 (16:847e)

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N. E. Steenrod and D. B. A. Epstein, Cohomology operations, Ann. of Math. Studies, no. 50, Princeton Univ. Press, Princeton, N. J., 1962. MR 26 #3056. MR 0145525 (26:3056)

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J. Milnor, The Steenrod algebras and its dual, Ann. of Math. (2) 67 (1958), 150-171. MR 20 #6092. MR 0099653 (20:6092)