Sawai Pongkao. 1994. Effect of juvenile leaf removal on symbiotic N fixation and yield of Mungbean (Vigna radiata (L.) wilezek). Bangkok:Kasetsart University;
Sawai Pongkao. (1994) Effect of juvenile leaf removal on symbiotic N fixation and yield of Mungbean (Vigna radiata (L.) wilezek) (รายงานผลงานวิจัย). Kasetsart University:Bangkok.
Sawai Pongkao. Effect of juvenile leaf removal on symbiotic N fixation and yield of Mungbean (Vigna radiata (L.) wilezek). Bangkok:Kasetsart University, 1994.
Sawai Pongkao. (1994) Effect of juvenile leaf removal on symbiotic N fixation and yield of Mungbean (Vigna radiata (L.) wilezek) (รายงานผลงานวิจัย). Kasetsart University:Bangkok.