Leonardo da Vinci
Jethro Kloss
Robin Wall Kimmerer
Dian Dincin Buchman
Scott Cunningham
Andrew Chevallier
Nicholas Culpeper
John Gerard
Dan Bensky
Sam Biser
M. Grieve
Lim Tong Kwee
United States. General Accounting Office
Faith Mitchell
O. Phelps Brown
John B. Lust
Jonathan L. Hartwell
James A. Duke
Thomas J. Elpel