MLA

Shankhwar, and Ravindra Kumar Sinha. Zero Index Metamaterials. Springer Singapore, 2021.

APA

Shankhwar, S., & Sinha, R. Kumar. (2021). Zero Index Metamaterials. Springer Singapore.

Chicago

Shankhwar, and Ravindra Kumar Sinha. Zero Index Metamaterials. : Springer Singapore, 2021.