“AGING AND SEXING WARBLERS.” The Warbler Guide, by Tom Stephenson et al., Princeton University Press, Princeton; Oxford, 2013, pp. 56–61, www.jstor.org/stable/j.ctt2jc8rf.8. Accessed 13 Aug. 2020.
Stephenson, T., Whittle, S., & Hamilton, C. (2013). AGING AND SEXING WARBLERS. In The Warbler Guide (pp. 56-61). Princeton; Oxford: Princeton University Press. Retrieved August 13, 2020, from www.jstor.org/stable/j.ctt2jc8rf.8
Stephenson, Tom, Scott Whittle, and Catherine Hamilton. "AGING AND SEXING WARBLERS." In The Warbler Guide, 56-61. Princeton; Oxford: Princeton University Press, 2013. Accessed August 13, 2020. www.jstor.org/stable/j.ctt2jc8rf.8.
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