@book {4341,
	title = {Trap-nesting wasps and bees: Life histories, nests and associates},
	year = {1967},
	pages = {570 pp},
	publisher = {Smithsonian Press},
	organization = {Smithsonian Press},
	address = {Washington, D.C.},
	keywords = {bees, cooperi, Eusiphona, Milichiidae},
	url = {http://milichiidae.info/sites/milichiidae.info/files/Krombein_1967.pdf},
	author = {Krombein, K. K.}
}
