Authors are Trudy Kendrick and Dan Drost Lesley . 2002.How to Grow Watercress in Your Garden Smithsonian Handbooks: Herbs. Dorling Kindersley Publishing, 304p.
Published April 2020
Utah State University Extension
Peer-reviewed fact sheet
put it in a proper referencing format
Kendrick, T., & Drost Lesley, D. (2002). How to Grow Watercress in Your Garden. In Smithsonian Handbooks: Herbs (pp. 304). Dorling Kindersley Publishing.
Utah State University Extension. (2020, April). Peer-reviewed fact sheet.