1. J.W.J. Williams, Algorithm 232, Heapsort 3, Comm.ACM, 7, 1964, pp. 347–348.
2. R.W. Floyd, Algorithm 245, Treesort 3, Comm.ACM, 1964, p. 701.
3. C.A.R. Hoare, Algorithm 63,64 and 65, Comm.ACM, 4(7), 1961,pp. 321–322.
4. E.H. Friend, Sorting on electronic computers, JACM 3(2), 1956, pp. 34–168.
5. D.E. Knuth, “The Art of Computer Programming Vol.3: Sorting and Searching”, Addison-Wesley, Reading, MA, 1973