Simon, J.E., A.F. Chadwick and L.E. Craker. 1984. Herbs: An Indexed Bibliography. 1971–1980.
Growing and Marketing Woodland Botanicals—Jeanine M. Davis
Commercial Production of Ginseng and Goldenseal—L.P. Stoltz
Alternative Crops Research in Virginia—Harbans L. Bhardwaj, Andy Hankins, Tadesse Mebrahtu, Jimmy Mullins, Muddappa Rangappa, Ozzie Abaye, and Gregory E. Welbaum
Phytomedicines as a New Crop Opportunity—Loren D. Israelsen
Sievers, A.F. 1930. The Herb Hunters Guide. Misc. Publ. No. 77. USDA, Washington DC.