APA
Poland J., Clement E. J., . (2009). The vegetative key to the british flora. [S.l.]: Botanical Society of the British Isles Natural England.
Chicago
Poland John, Clement Eric J, . 2009. The vegetative key to the british flora. [S.l.]: Botanical Society of the British Isles Natural England.
Harvard
Poland J., Clement E. J., . (2009). The vegetative key to the british flora. [S.l.]: Botanical Society of the British Isles Natural England.
MLA
Poland John, Clement Eric J, . The vegetative key to the british flora. [S.l.]: Botanical Society of the British Isles Natural England. 2009.