Williams, Y. M., Williams, S. E., Alford, R. A., Waycott, M., & Johnson, C. N. (2006). Niche breadth and geographical range: Ecological compensation for geographical rarity in rainforest frogs. The Royal Society.

Williams, Yvette M., Stephen E. Williams, Ross A. Alford, Michelle Waycott, και Christopher N. Johnson. Niche Breadth and Geographical Range: Ecological Compensation for Geographical Rarity in Rainforest Frogs. The Royal Society, 2006.

Williams, Yvette M., et al. Niche Breadth and Geographical Range: Ecological Compensation for Geographical Rarity in Rainforest Frogs. The Royal Society, 2006.