Andreescu, T., & Feng, Z. (2004). A path to combinatorics for under graduates: Counting strategies. Birkhauser.
Chicago Edition CitationAndreescu, Titu, and Zuming Feng. A Path to Combinatorics for Under Graduates: Counting Strategies. Birkhauser, 2004.
MLA Edition CitationAndreescu, Titu, and Zuming Feng. A Path to Combinatorics for Under Graduates: Counting Strategies. Birkhauser, 2004.
Warning: These citations may not always be 100% accurate.