Template:Sipman, 1992a
- Sipman, H.J.M. 1992. Results of a lichenological and bryological exploration of Cerro Guaiquinima (Guayana Highland, Venezuela). Tropical Bryology 6: 1–31. RLL Suppl. Rec.# 958 – Recent Literature on Lichens DOI: 10.11646/bde.6.1.2 RLL (PDF)