Agresti, Alan & Finlay, Barbara(2009):Statistical Methods for the Social Sciences, Fourth Edition. Pearson, chapters 1-8.
Bryman, Alan(2004):Social Research methods 3rd edition, Oxford: Oxford University Press. Ch. 3-11, 13-16.
Chalmers, Alan F.(1999):What is this thing called science?. Buckingham: Open University Press. Ch. 1-2, 4-10, 14-16.