Citation | Muhammad, S., B.N. Siddiqui, F.U. Khan and N. Khan. 2020. Self-perceived constraints of extension field staff affecting their working efficiency in Khyber Pakhtunkhwa, Pakistan. Sarhad Journal of Agriculture, 37(1): 64-70. DOI | http://dx.doi.org/10.17582/journal.sja/2021/37.1.64.70