9,171 Siti Nur Jelita Sabran 2018-11-07 http://www.nrcresearchpress.com/doi/pdfplus/10.4141/cjps79-165 Warwick, S. I. (1979). THE BIOLOGY OF CANADIAN WEEDS.: 37 Poa annua L. Canadian Journal of Plant Science, 59(4), 1053-1066. NULL