lesser extent primary sources quote states primary sources acceptable sources without primary sources secondary sources quote read exact page discern meaning starting become annoyed incessant reversions personal bias sri lanka old system measurement used land perch rood old british imperial measurement systems realtor page clearly states perch rood old imperial measurement systems sri lanka use old system imperial measurement system familiar system explain feel qualified edit stick neck get involved say article women fashion yet feel qualified summarily delete changes made good faith citing reliable primary sources countries question serious saying someone needs read information write book cite