Suwipa Sree-iam. (1991) The development of mosquito-repellent formulations containing citronella oil and plai oil (Zingiber cassumunar Roxb.). Mahidol University,:ม.ป.ท.Suwipa Sree-iam. 1991. The development of mosquito-repellent formulations containing citronella oil and plai oil (Zingiber cassumunar Roxb.). ม.ป.ท.:Mahidol University,;Suwipa Sree-iam. The development of mosquito-repellent formulations containing citronella oil and plai oil (Zingiber cassumunar Roxb.). ม.ป.ท.:Mahidol University, 1991. Print.