Tohutoro APA (7th ed.)

Baues, H. J. (1977). Obstruction theory on homotopy classification maps. Springer-Verlag.

Tohutoru Kātū Chicago (17th ed.)

Baues, Hans J. Obstruction Theory on Homotopy Classification Maps. Berlín: Springer-Verlag, 1977.

Tohutoro MLA (9th ed.)

Baues, Hans J. Obstruction Theory on Homotopy Classification Maps. Springer-Verlag, 1977.