Sphaerophoria asymmetrica (English Wikipedia)

Analysis of information sources in references of the Wikipedia article "Sphaerophoria asymmetrica" in English language version.

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esc-sec.ca

Vockeroth, J.R. (1992). The Flower Flies of the Subfamily Syrphinae of Canada, Alaska, and Greenland (Diptera: Syrphidae). Part 18. The Insects and Arachnids of Canada (PDF). Ottawa, Ontario: Canadian Government Pub Centre. pp. 1–456. ISBN 0-660-13830-1.