1. IPA workshop report on problems of protea growing and IPA panel discussion. Introduction to the workshop;Ackerman;J. Int. Protea Assoc.,1995
2. The development of Leucospermum and Serruria as flowering potted plants;Ackerman;Acta Hort.,1995
3. Research and development of protea pot plants for export under South African and Israeli conditions;Ackerman;Protea News,1991
4. ”Cutting grafts” for Leucospermum and Leucadendron-a method for quick propagation by simultaneous rooting and grafting;Ackerman;Acta Hort.,1997
5. Development of Leucospermum tolerant to calcareous soils for the protea industry;Ackerman;J. Int. Protea Assoc.,1995