Tipo และ Oreme. (1990) Effectiveness of citronella ointment (mosquito repellent) in preventing mosquito borne diseases. Mahidol University,:ม.ป.ท.Tipo และ Oreme. 1990. Effectiveness of citronella ointment (mosquito repellent) in preventing mosquito borne diseases. ม.ป.ท.:Mahidol University,;Tipo และ Oreme. Effectiveness of citronella ointment (mosquito repellent) in preventing mosquito borne diseases. ม.ป.ท.:Mahidol University, 1990. Print.