Dwivedi, A., & Gupta, G. (1993). Afforestation of arid lands. Scientific.
Chicago Style (17th ed.) ZitazioaDwivedi, A.P, eta G.N Gupta. Afforestation of Arid Lands. Jodhpur: Scientific, 1993.
MLA (9th ed.) ZitazioaDwivedi, A.P, eta G.N Gupta. Afforestation of Arid Lands. Scientific, 1993.
Kontuz: berrikusi erreferentzia hauek erabili aurretik.