Lachlan, R. F., Anderson, R. C., Peters, S., Searcy, W. A., & Nowicki, S. (2014). Typical versions of learned swamp sparrow song types are more effective signals than are less typical versions. The Royal Society.

Lachlan, R. F., R. C. Anderson, S. Peters, W. A. Searcy, och S. Nowicki. Typical Versions of Learned Swamp Sparrow Song Types Are More Effective Signals Than Are Less Typical Versions. The Royal Society, 2014.

Lachlan, R. F., et al. Typical Versions of Learned Swamp Sparrow Song Types Are More Effective Signals Than Are Less Typical Versions. The Royal Society, 2014.