Creech, J. L. (John Lewis), 1920-; Dowdle, R. F. & Hawley, W. O. Sphagnum moss for plant propagation., book, July 1955; (https://digital.library.unt.edu/ark:/67531/metadc6155/m1/1/: accessed September 19, 2019), University of North Texas Libraries, Digital Library, digital.library.unt.edu; .