I found the citation below [here][1]

89e:03084  03E20
Swanson, Leonard G. (1-PRLS); Hansen, Rodney T.
The equivalence of the multiplication, pigeonhole, induction, and well
ordering principles. (English)
Internat. J. Math. Ed. Sci. Tech. 19 (1988), no. 1, 129--131.
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Informal set-theoretic arguments are given for the equivalence of the
principles mentioned in the title, all of which are stated for the natural
numbers. The authors work in Zermelo-Fraenkel set theory, but such arguments
should be given in a weaker system of set theory or arithmetic in which the
principles in question are not theorems. The strength of several forms of
the pigeonhole principle was studied by T. von der Twer [Arch. Math. Logik
Grundlag. 21 (1981), no. 1-2, 69--76; MR 84e:03072].


  [1]: http://www.math.uni-bielefeld.de/~sillke/NEWS/pigeon-hole-principle