United States (North America)
- Hartman, R. L. & B. E. Nelson. 1998. Novelties from North America north of Mexico: A 20-Year Vascular plant Diversity Baseline. 1–51 (mss.). http://www.tropicos.org/Reference/11044
- Wagner, W. H. J., A. R. Smith & T. R. Pray. 1983. A cliff brake hybrid Pellaea bridgesii x mucronata and its systematic significance. Madroño 30: 69–83. http://www.tropicos.org/Reference/11527
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