Zero Index Metamaterials
  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.