APA
Jahr E. H., . (1991). Language and its Ecology. Bangolore: De Gruyter Mouton.
Chicago
Jahr Ernst Hermann, . 1991. Language and its Ecology. Bangolore: De Gruyter Mouton.
Harvard
Jahr E. H., . (1991). Language and its Ecology. Bangolore: De Gruyter Mouton.
MLA
Jahr Ernst Hermann, . Language and its Ecology. Bangolore: De Gruyter Mouton. 1991.