focusing on the part of the park with the highest peaks, the book planalto de itatiaia regiao das agulhas negras, by helton perillo ferreira leite is an excellent work on the region, rich of interesting facts. 

the study flora do parque nacional do itatiaia - brasil: peperomia (piperaceae) (flora of national park itatiaia - brazil: peperomia (piperaceae)  by daniele monteiro and elsie franklin guimarães aims to describe the taxa of peperomia found in the park, including their preferred habitat, highlighting rare and endemic species and contributing to the flora of state rio de janeiro.

provided by the instituto estadual de ambiente - inea, on this page there is a simple map of all the protected areas in the state of rio de janeiro, along with a very important set of guidelines for the prevention of fires.