National Coffee Growers' Association. Some facts about Porto Rico coffee. 1913.
Van Leenhoff, Johannes W. Coffee planting in Porto Rico. Mayaguez, 1904. 14 pp.
PORTUGUESE COLONIES
Sociedade de Geooraphiade Lisboa. Exposição colonial de algodão, borracha, cacau e café. 1906. 104 pp.
SIERRA LEONE
Highland coffee of Sierra Leone (Coffea stenophylla, C. Don). Royal Botanic Gardens, Kew, Bull. of Misc. Information, 1896: 189–191.
SOUTH AMERICA
Fox, Alvin. Liberian coffee in South America. Simmons' Spice Mill, 1918, XLI: 549–550.
TRINIDAD
Trinidad coffee. Royal Botanic Gardens, Kew, Bull. of Misc. Information, 1888: 129–133.