Brassinosteroids: A Class of Plant Hormone
  MLA
  Shamsul Hayat, Aqil Ahmad, Aqil Ahmad, and Shamsul Hayat. Brassinosteroids: A Class of Plant Hormone. Springer Netherlands, 2011.
  APA
  Shamsul Hayat, A. Ahmad, Ahmad, A., & Hayat, S. (2011). Brassinosteroids: A Class of Plant Hormone. Springer Netherlands.
  Chicago
  Shamsul Hayat, Aqil Ahmad, Aqil Ahmad, and Shamsul Hayat. Brassinosteroids: A Class of Plant Hormone. : Springer Netherlands, 2011.