APA Style

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

MLA Style

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