Thorp, R. W. (1983). Bumble bees and cuckoo bumble bees of California (Hymenoptera: Apidae). University of California Press.
Citace podle Chicago (17th ed.)Thorp, Robbin W. Bumble Bees and Cuckoo Bumble Bees of California (Hymenoptera: Apidae). Berkeley: University of California Press, 1983.
Citace podle MLA (9th ed.)Thorp, Robbin W. Bumble Bees and Cuckoo Bumble Bees of California (Hymenoptera: Apidae). University of California Press, 1983.
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