APA Style

Smith, R, M., Burtt, B, L. (1972). Key Species in the Taxonomic History of Zingiberaceae . : THE ROYAL BOTANIC GARDEN EDINBURGH.

MLA Style

Smith, R., M.., Burtt, B., L.. "Key Species in the Taxonomic History of Zingiberaceae". : THE ROYAL BOTANIC GARDEN EDINBURGH, 1972. Text.