Spellerberg, I. F. (1992). Evaluation and assessment for conservation: Ecological guidelines for determining priorities for nature conservation. London: Chapman & Hall.
Dyfyniad Arddull ChicagoSpellerberg, Ian F. Evaluation and Assessment for Conservation: Ecological Guidelines for Determining Priorities for Nature Conservation. London: Chapman & Hall, 1992.
Dyfyniad MLASpellerberg, Ian F. Evaluation and Assessment for Conservation: Ecological Guidelines for Determining Priorities for Nature Conservation. London: Chapman & Hall, 1992.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.