“Preface.” Trees and Shrubs of Kentucky, by Mary E. Wharton and Roger W. Barbour, University Press of Kentucky, Lexington, Kentucky, 1973, pp. ix-x, www.jstor.org/stable/j.ctt130jb1x.3. Accessed 13 Aug. 2020.
Wharton, M., & Barbour, R. (1973). Preface. In Trees and Shrubs of Kentucky (pp. Ix-X). Lexington, Kentucky: University Press of Kentucky. Retrieved August 13, 2020, from www.jstor.org/stable/j.ctt130jb1x.3
Wharton, Mary E., and Roger W. Barbour. "Preface." In Trees and Shrubs of Kentucky, Ix-X. Lexington, Kentucky: University Press of Kentucky, 1973. Accessed August 13, 2020. www.jstor.org/stable/j.ctt130jb1x.3.
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