The MapBiomas data are public, open and free under Creative Commons CC-CY-SA license and by referencing the source observing the following format:
"MapBiomas Project- Collection [version] of the Annual Series of Land Use and Land Cover Maps of Brazil, accessed on [date] through the link: [LINK]"
"MapBiomas Project - is a multi-institutional initiative to generate annual land use and land cover maps from automatic classification processes applied to satellite imagery. The full description of the project can be found at http://mapbiomas.org".
Access here the reference scientific publication: Souza at. al. (2020) - Reconstructing Three Decades of Land Use and Land Cover Changes in Brazilian Biomes with Landsat Archive and Earth Engine - Remote Sensing, Volume 12, Issue 17, 10.3390/rs12172735.