I'm looking for an undergraduate or beginning graduate level text from which to self-learn quasigroup theory. An emphasis on using quasigroups to understand the structure of groups would be appreciated. I prefer texts that are leisurely and systematic. I like having only a few examples, but those examples worked out in great detail.
Bruck R.H.: A Survey of Binary Systems. Springer-Verlag, Berlin-Gottingen-Heidelberg, 1966.
Moreover, there is a good book
Belousov V.D.: Foundations of the theory of quasigroups and loops, Moscow, 1967,
but as you see, it is only in Russian