"Guaiacum officinale L."Germplasm Resources Information Network. United States Department of Agriculture. 2003-03-05. Arkiveret fra originalen 13. september 2009. Hentet 2010-10-03.
"National Symbols of Jamaica". Emancipation & Independence. Jamaica Information Service. Arkiveret fra originalen 28. oktober 2011. Hentet 5. december 2016.
De morbo gallico, 16. århundrede, Jean Chéradames oversættelse af et værk om syfilis skrevet af Ulrich von Hutten (1488-1523). "All the inhabitauntes of that ylonde somtyme be diseased with the french pockes, lykewyse as we be with the mesels, & small pockes. Nor they haue no other re∣medy for it but this." (Kapitel VI)
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"Guaiacum officinale L."Germplasm Resources Information Network. United States Department of Agriculture. 2003-03-05. Arkiveret fra originalen 13. september 2009. Hentet 2010-10-03.
"National Symbols of Jamaica". Emancipation & Independence. Jamaica Information Service. Arkiveret fra originalen 28. oktober 2011. Hentet 5. december 2016.
