Davies, R. A., & Lloyd, K. M. (1991). Index kewensis: Supplement nineteen names of seed - bearing plants at the rank of family and below published between january 1986 and the end of 1990 with some omissions from earlier years. Clarendon.
Cita Chicago Style (17a ed.)Davies, R. A., y K. M. Lloyd. Index Kewensis: Supplement Nineteen Names of Seed - Bearing Plants at the Rank of Family and Below Published Between January 1986 and the End of 1990 with Some Omissions from Earlier Years. Oxford: Clarendon, 1991.
Cita MLA (8a ed.)Davies, R. A., y K. M. Lloyd. Index Kewensis: Supplement Nineteen Names of Seed - Bearing Plants at the Rank of Family and Below Published Between January 1986 and the End of 1990 with Some Omissions from Earlier Years. Clarendon, 1991.