MapBiomas data is public, open and free under Creative Commons CC-BY license and referencing the source observing the format below:
«MapBiomas – Collection [version] of the [annual/monthly] Series of Maps of [Land Cover and Use/Water Surface] of Venezuela, consulted on [date] through the link: [LINK]»
In addition, there are scientific articles from MapBiomas that can be used to cite them.