@book{103648,
	author = {Loehr, Nicholas A. and Loehr, Nicholas A.},
	title = {Combinatorics /},
	publisher = {CRC Press,},
	year = {2018},
	series = {Discrete mathematics and its applications},
	address = {Boca Raton :},
	edition = {2nd ed.},
	note = {"A Chapman & Hall book."}
}