Patcharawadee Wattanawikkit, Eric Bunn, Kongkanda Chayanarit, and Sureeya Tantiwiwat, “Effect of Cytokinins (BAP and TDZ) and Auxin (2,4-D) on Growth and Development of Paphiopedilum callosum”, Agr. Nat. Resour., vol. 45, no. 1, pp. 12–19, Feb. 2011.