On Grothendieck universes
Compositio Mathematica, Tome 21 (1969) no. 1, p. 1-3
@article{CM_1969__21_1_1_0,
     author = {Williams, N. H.},
     title = {On Grothendieck universes},
     journal = {Compositio Mathematica},
     publisher = {Wolters-Noordhoff Publishing},
     volume = {21},
     number = {1},
     year = {1969},
     pages = {1-3},
     zbl = {0175.00701},
     mrnumber = {244035},
     language = {en},
     url = {http://www.numdam.org/item/CM_1969__21_1_1_0}
}
Williams, N. H. On Grothendieck universes. Compositio Mathematica, Tome 21 (1969) no. 1, pp. 1-3. http://www.numdam.org/item/CM_1969__21_1_1_0/

P. Gabriel [1] Des catégories abéliennes. Bulletin de la Sociéte Mathématique de France, Vol. 90 (1962), pp. 324-448. | Numdam | MR 232821 | Zbl 0201.35602

K. Gödel [2] The consistency of the continuum hypothesis... Princeton, 1940. | MR 2514 | Zbl 0061.00902

A.H. Kruse [3] Grothendieck universes and the super-complete models of Shepherdson. Compositio Mathematica, Vol.17 (1965), pp. 96-101. | Numdam | MR 180481 | Zbl 0129.00505

J. Von Neumann, [4] Über eine Widerspruchsfreiheitsfrage in der axiomatischen Mengenlehre. Journal für die reine und angewandte Mathematik, Vol. 160 (1929), pp. 227-241. J.C. Shepherdson[5] Inner models for set theory - part II. The Journal of Symbolic Logic, Vol. 17 (1952), pp. 225-237.

A. Tarski [6] Über unerreichbare Kardinalzahlen. Fundamenta Mathematicae, Vol. 30 (1938), pp. 68 - 89. | JFM 64.0033.04 | Zbl 0018.34702