[H] Naive set theory by P Halmos,
[A] Algebra by M Artin, Prentice-Hall
[HK] K Hoffman and R Kunze, Prentice-Hall India.
[An] Combinatorics of finite sets by I Anderson,
Oxford Science Publications
[S] Enumerative combinatorics (Volume I)
by RP Stanley
[B] Combinatorics by B Bollobás.
[C] Combinatorics by Peter J Cameron.
[J] Extremal Combinatorics by Stasys Jukna.
[AS] The Probabilistic Method by
N Alon and and J Spencer. Wiley.