@book {969,
	title = {Aussereuropaische zweiflugelige Insekten. Als Fortsetzung des Meigenschen Werkes},
	year = {1830},
	pages = {xii + 684 pp., 5 pls.},
	address = {Hamm : Schulzische Buchhandlung},
	url = {http://www.biodiversitylibrary.org/bibliography/14603},
	author = {Wiedemann, C.R.W.}
}
@inbook {1809,
	title = {Fam. Syrphidae},
	booktitle = {Biologia Centrali Americana, Zoologia - Insecta - Diptera},
	volume = {3},
	year = {1891},
	pages = {1-56; 57-72; 73-78, pl. 1, 2, figs. 1-12},
	address = {London},
	url = {http://www.sil.si.edu/digitalcollections/bca/navigation/bca_16_03_00/bca_16_03_00select.cfm},
	author = {Williston, S.W.},
	editor = {Godman, F.D. and Salvin, O.}
}
@article {178,
	title = {New American Syrphidae},
	journal = {Bulletin of the American Museum of Natural History},
	volume = {78},
	year = {1941},
	pages = {243-304},
	url = {http://digitallibrary.amnh.org/dspace/handle/2246/377},
	author = {Curran, C.H.}
}
@article {518,
	title = {Keys to Nearctic Syrphidae (Diptera)},
	year = {1991},
	pages = {88},
	address = {unpublished keys},
	author = {Thompson, F. C.}
}
