Hilton, Peter John (1955). “On the homotopy groups of the union of spheres”. 《Journal of the London Mathematical Society》 (영어) 30 (2): 154–172. doi:10.1112/jlms/s1-30.2.154. ISSN0024-6107. MR0068218.
Uehara, Hiroshi; Massey, William S. (1957). 〈The Jacobi identity for Whitehead products〉. 《Algebraic geometry and topology. A symposium in honor of S. Lefschetz》 (영어). Princeton University Press. 361–377쪽. MR0091473.
Hilton, Peter John (1955). “On the homotopy groups of the union of spheres”. 《Journal of the London Mathematical Society》 (영어) 30 (2): 154–172. doi:10.1112/jlms/s1-30.2.154. ISSN0024-6107. MR0068218.
Hilton, Peter John (1955). “On the homotopy groups of the union of spheres”. 《Journal of the London Mathematical Society》 (영어) 30 (2): 154–172. doi:10.1112/jlms/s1-30.2.154. ISSN0024-6107. MR0068218.
Čech, E. (1932). 〈Höherdimensionale Homotopiegruppen〉. 《Verhandlungen des Internationalen Mathematiker-Kongresses: Zürich 1932. Zweiter Band》 (독일어). O. Füssli. 203쪽. JFM58.0646.06.
Hurewicz, Witold (1935). “Beiträge zur Topologie der Deformationen I. Höherdimensionale Homotopiegruppen”. 《Proceedings of the Section of Sciences, Koninklijke Akademie van Wetenschappen te Amsterdam》 (독일어) 38: 112–119. JFM61.0618.01. Zbl0010.37801.
Hurewicz, Witold (1935). “Beiträge zur Topologie der Deformationen II. Homotopie- und Homologiegruppen”. 《Proceedings of the Section of Sciences, Koninklijke Akademie van Wetenschappen te Amsterdam》 (독일어) 38: 521–528. JFM61.0619.01. Zbl0011.37101.
Hurewicz, Witold (1936). “Beiträge zur Topologie der Deformationen III. Klassen und Homologietypen von Abbildungen”. 《Proceedings of the Section of Sciences, Koninklijke Akademie van Wetenschappen te Amsterdam》 (독일어) 39: 117–126. JFM62.0678.02. Zbl0013.22903.
Hurewicz, Witold (1936). “Beiträge zur Topologie der Deformationen IV. Asphärische Räume”. 《Proceedings of the Section of Sciences, Koninklijke Akademie van Wetenschappen te Amsterdam》 (독일어) 39: 215–224. Zbl0013.28303.