Biotechnology in Agriculture and Forestry Vol. Hummer, K. E. 1998. Biotechnology of plant germplasm acquisition. Plant Conservation Biotechnology. Taylor and Francis Ltd. London.
Forsythia flower bud cold hardiness.
Dormancy stages and cold hardines of red- osier dogwood. Leaf anatomy and water stress of aseptically cultured Prunus insititia 'Pixy'. Hummer, K. 1989. Hummer, K.E. 1989.Rubus germplasm at the National Clonal Germplasm Repository. Program of the International Rubus and Ribes Symposium.