SINGH, S. W. (2010). Identification of weeds and their control measures. Tanay Sharma Scientific Publishers.
Chicago-viite (17. p.)SINGH, Surjit Walia. Identification of Weeds and Their Control Measures. Tanay Sharma Scientific Publishers, 2010.
MLA-viite (9. p.)SINGH, Surjit Walia. Identification of Weeds and Their Control Measures. Tanay Sharma Scientific Publishers, 2010.
Varoitus: Nämä viitteet eivät aina ole täysin luotettavia.