Maxwell, C; Griffiths H; Young AJ (1994). "Photosynthetic acclimation to light regime and water stress by the C3-CAM epiphyte Guzmania monostachia: gas-exchange characteristics, photochemical efficiency and the xanthophyll cycle". Functional Ecology. 8 (6): 746–754. doi:10.2307/2390234. JSTOR2390234.
Maxwell, C; Griffiths H; Young AJ (1994). "Photosynthetic acclimation to light regime and water stress by the C3-CAM epiphyte Guzmania monostachia: gas-exchange characteristics, photochemical efficiency and the xanthophyll cycle". Functional Ecology. 8 (6): 746–754. doi:10.2307/2390234. JSTOR2390234.