Não informado. (1909). Circular of the Department of Agriculture, Trinidad and Tobago. Circular of the Department of Agriculture.
Παραπομπή σε μορφή Chicago (17η εκδ.)Não informado. Circular of the Department of Agriculture, Trinidad and Tobago. Port of Spain: Circular of the Department of Agriculture, 1909.
Παραπομπή σε μορφή MLA (8th εκδ.)Não informado. Circular of the Department of Agriculture, Trinidad and Tobago. Circular of the Department of Agriculture, 1909.
Πρόσοχή: Οι παραπομπές μπορεί να μην είναι 100% ακριβείς.