no. 3
Homotopy type of mapping tracks
Compositio Mathematica, Tome 22 (1970) no. 3, pp. 261-264. 
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     author = {Croom, F. H.},
     title = {Homotopy type of mapping tracks},
     journal = {Compositio Mathematica},
     pages = {261--264},
     publisher = {Wolters-Noordhoff Publishing},
     volume = {22},
     number = {3},
     year = {1970},
     mrnumber = {278302},
     zbl = {0198.56202},
     language = {en},
     url = {http://archive.numdam.org/item/CM_1970__22_3_261_0/}
}
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Croom, F. H. Homotopy type of mapping tracks. Compositio Mathematica, Tome 22 (1970) no. 3, pp. 261-264. http://archive.numdam.org/item/CM_1970__22_3_261_0/

F.H. Croom [1] Exact loop space sequences, to appear. | MR | Zbl

Albrecht Dold [2] Partitions of unity in the theory of fibrations, Ann. of Math., 78 (1963) 223-255. | MR | Zbl