Melese, W. “EFFECT OF FARM YARD MANURE APPLICATION RATE ON YIELD AND YIELD COMPONENTS OF LETTUCE (LACTUCA SATIVA) AT JIMMA SOUTHWESTERN ETHIOPIA”. International Journal of Research -GRANTHAALAYAH, vol. 4, no. 8, Aug. 2016, pp. 75-83, doi:10.29121/granthaalayah.v4.i8.2016.2565.