Hardy herbaceous perennials

MLA

Jelitto, Leo, et al. Hardy Herbaceous Perennials. 3rd ed. / Portland, Or.: Timber Press, 1990.

APA

Jelitto, L., Baumgardt, J. Philip, Epp, M. E, Fessler, A., & Schacht, W. (1990). Hardy herbaceous perennials. 3rd ed. / Portland, Or.: Timber Press.

Chicago

Jelitto, Leo, Alfred Fessler, and Wilhelm Schacht. Hardy Herbaceous Perennials. Translated by Michael E Epp. Edited by John Philip Baumgardt. 3rd ed. / Portland, Or.: Timber Press, 1990.