SamuelS.EilenbergSamuelS., SaundersS.MacLaneSaundersS., Relations Between Homology and Homotopy Groups of Spaces, „The Annals of Mathematics”, 46 (3), 1945, s. 480, DOI: 10.2307/1969165, JSTOR: 1969165(ang.).
SamuelS.EilenbergSamuelS., SaundersS.MacLaneSaundersS., Relations Between Homology and Homotopy Groups of Spaces. II, „The Annals of Mathematics”, 51 (3), 1950, s. 514, DOI: 10.2307/1969365, JSTOR: 1969365(ang.).
SamuelS.EilenbergSamuelS., SaundersS.MacLaneSaundersS., Relations Between Homology and Homotopy Groups of Spaces, „The Annals of Mathematics”, 46 (3), 1945, s. 480, DOI: 10.2307/1969165, JSTOR: 1969165(ang.).
SamuelS.EilenbergSamuelS., SaundersS.MacLaneSaundersS., Relations Between Homology and Homotopy Groups of Spaces. II, „The Annals of Mathematics”, 51 (3), 1950, s. 514, DOI: 10.2307/1969365, JSTOR: 1969365(ang.).
SamuelS.EilenbergSamuelS., Automata, Languages and Machines, New York: Academic Press, 1974–1976, ISBN 0-12-234001-9, OCLC915666(ang.). Brak numerów stron w książce