APA

Aylward B. A., Barbier E. B., . (1992). What is biodiversity worth to a developing country? capturing the pharmaceutical value of species information. London: London Environmental Economics Centre.

Chicago

Aylward Bruce A, Barbier Edward B, . 1992. What is biodiversity worth to a developing country? capturing the pharmaceutical value of species information. London: London Environmental Economics Centre.

Harvard

Aylward B. A., Barbier E. B., . (1992). What is biodiversity worth to a developing country? capturing the pharmaceutical value of species information. London: London Environmental Economics Centre.

MLA

Aylward Bruce A, Barbier Edward B, . What is biodiversity worth to a developing country? capturing the pharmaceutical value of species information. London: London Environmental Economics Centre. 1992.