Aphiphan Pookpakdi. 1984. Soil moisture and plant establishment as an important factor in soybean planted after rice at Kampangsaen district. Bangkok:Kasetsart University;
Aphiphan Pookpakdi. (1984) Soil moisture and plant establishment as an important factor in soybean planted after rice at Kampangsaen district (รายงานผลงานวิจัย). Kasetsart University:Bangkok.
Aphiphan Pookpakdi. Soil moisture and plant establishment as an important factor in soybean planted after rice at Kampangsaen district. Bangkok:Kasetsart University, 1984.
Aphiphan Pookpakdi. (1984) Soil moisture and plant establishment as an important factor in soybean planted after rice at Kampangsaen district (รายงานผลงานวิจัย). Kasetsart University:Bangkok.