Potter's new cyclopaedia of medicinal herbs and preparations /
by R. C. Wren. Re-edited and enl. by R. W. Wren. Foreword by T. E. Wallis.

APA Citation

Wren, R. C. (Richard Cranfield)., Wren, R. W. (Richard W.). (1972). Potter's new cyclopaedia of medicinal herbs and preparations. New York: Harper & Row.

MLA Citation

Wren, R. C. (Richard Cranfield), 1864-1931, and R. W. (Richard W.) Wren. Potter's New Cyclopaedia of Medicinal Herbs And Preparations. New York: Harper & Row, 1972.

Warning: These citations may not always be complete (especially for serials).