APA (7th ed.) Citation

Deng, Y., Ma, L., & Li, Q. Two new species of Psen Latreille, 1796 (Hymenoptera, Apoidea, Crabronidae) from China, with a key to Psen species of China. Pensoft Publishers.

Chicago Style (17th ed.) Citation

Deng, Yao, Li Ma, and Qiang Li. Two New Species of Psen Latreille, 1796 (Hymenoptera, Apoidea, Crabronidae) from China, with a Key to Psen Species of China. Pensoft Publishers.

MLA (9th ed.) Citation

Deng, Yao, et al. Two New Species of Psen Latreille, 1796 (Hymenoptera, Apoidea, Crabronidae) from China, with a Key to Psen Species of China. Pensoft Publishers.