Calder, D.M., Cropper, S.C. & Tonkinson, D. (1989) The ecology of Thelymitra epipactoides F. Muell. (Orchidaceae) in Victoria, Australia, and the implications for management of the species. Australian Journal of Botany 37: 19-32.  

Calder, M. & Cropper, S. (1989) “Species conservation in situ - What information should we have? A case study with Thelymitra epipactoides” In Occasional Paper No. 2: The conservation of threatened species and their habitats. pp. 261-262: R841. (Australian Commitee for IUCN; Canberra).  

Cropper, S.C. (1989) “Victorian Rare or Threatened Plant Database - Instructions for data collection” (Research Section Parks Branch, National Parks and Wildlife Division, Department of Conservation, Forests and Lands; Melbourne).  

Cropper, S.C., Calder, D.M. & Tonkinson, D. (1989) Thelymitra epipactoides F. Muell. (Orchidaceae): The morphology, biology and conservation of an endangered species. Proceedings of the Royal Society of Victoria 101: 89-101.  

Cropper, S.C., Tonkinson, D.A. & Scott, G.A.M. (1991) “A census of Victorian bryophytes” (The Department of Conservation and Environment; East Melbourne).  

Cropper, S. (1989a) “The conservation of Lepidium hyssopifolium, a native peppercress that requires disturbed environment” In Occasional Paper No. 2: The conservation of threatened species and their habitats. pp. 263-264: R841. (Australian Commitee for IUCN; Canberra).  

Cropper, S. (1989b) “The Victorian Rare or Threatened Plant Database - Instructions for collecting Data” (Department of Conservation, Forests and Land - Victoria; Melbourne).  

Cropper, S. (1991) “The Resource Evaluation and Monitoring System - A system for monitoring natural and cultural assets” (Department of Conservation and Environment; Melbourne).  

Cropper, S. (1992) Computer systems for conservation of plant species. Advances in Nature Conservation 1 (1): 31-33.  

Cropper, S. & Calder, D.M. (1990) The floral biology of Thelymitra epipactoides (Orchidaceae), and the implications of pollination by deceit on the survival of this rare orchid. Plant Systematics and Evolution 170: 11-27.  

Cropper, S.C. (1993) “Management of endangered plants” (CSIRO Publishing; East Melbourne).  

Cropper, S. (1987) Ecological Notes and Suggestions for conservation of a recently discovered site of Lepidium hyssopifolium Desv. (Brassicaceae) at Bolwarrah, Victoria, Australia. Biological Conservation 41: 269-278.