MLA

Singh, Ajay Kumar, and Partha Narayan Hajra. Coalbed Methane In India. Springer International Publishing, 2018.

APA

Singh, A. Kumar, & Hajra, P. Narayan. (2018). Coalbed Methane in India. Springer International Publishing.

Chicago

Singh, Ajay Kumar, and Partha Narayan Hajra. Coalbed Methane In India. : Springer International Publishing, 2018.