Woraprach Jarupan. 2000. Effects of lead and humic acid on duckweed, Lemna minor. Faculty of Graduate Studies, Mahidol University;
Woraprach Jarupan. (2000) Effects of lead and humic acid on duckweed, Lemna minor . Mahidol University/Bangkok.
Woraprach Jarupan. Effects of lead and humic acid on duckweed, Lemna minor. . Bangkok:Mahidol University, 2000.
Woraprach Jarupan. (2000) Effects of lead and humic acid on duckweed, Lemna minor . Mahidol University/Bangkok.