{{cite journal | last1=Rao | first1=S. R. | author2=A. Qayyum | author3=A. Razzaq | author4=M. Ahmad | author5=I. Mahmood | author6=A. Sher | year=2012 | title=ROLE OF FOLIAR APPLICATION OF SALICYLIC ACID AND L-TRYPTOPHAN IN DROUGHT TOLERANCE OF MAIZE | journal=Journal of Animal and Plant Sciences | volume=22 | issue=3 | pages=768-772 | issn=1018-7081 | eissn=2309-8694 | publisher=Pakistan Agricultural Scientists Forum | url=https://thejaps.org.pk/AbstractView.aspx?mid=2012-JAPS-342}}