R. S. Arya and M. S. Haque, “Air Layering in <I>Pinus patula</I> Schi. And Cham. And <I>Pinus caribaea</I> Morelet. Var. <I>Hondurensis</I>”;, Indian Forester, vol. 108, no. 1, pp. 66–68, Jan. 1982.