Não informado. Soil and land-use surveys. University of the West Indies, Department of Soil Science.
Παραπομπή σε μορφή Chicago (17η εκδ.)Não informado. Soil and Land-use Surveys. St. Augustine, Trinidad e Tobago: University of the West Indies, Department of Soil Science.
Παραπομπή σε μορφή MLA (8th εκδ.)Não informado. Soil and Land-use Surveys. University of the West Indies, Department of Soil Science.
Πρόσοχή: Οι παραπομπές μπορεί να μην είναι 100% ακριβείς.