MLA

Ao, et al. Transactions On Engineering Technologies : World Congress On Engineering 2019. Springer Singapore, 2021.

APA

Ao, A., Ao, S., Gelman, L., & Kim, H. (2021). Transactions on engineering technologies : World Congress on Engineering 2019. Springer Singapore.

Chicago

Ao, Sio-Iong Ao, Len Gelman, and Haeng-kon Kim. Transactions On Engineering Technologies : World Congress On Engineering 2019. : Springer Singapore, 2021.