Haapanen, A., Helminen, M., & Suomalainen, H. K. (1973). The Spring Arrival and breeding phenology of the whooper swan, Cygnus C. Cygnus, in Finland.
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Chicago Style (17th ed.) Citation
Haapanen, Antti, Matti Helminen, and Hannu K. Suomalainen. The Spring Arrival and Breeding Phenology of the Whooper Swan, Cygnus C. Cygnus, in Finland. 1973.
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MLA (9th ed.) Citation
Haapanen, Antti, et al. The Spring Arrival and Breeding Phenology of the Whooper Swan, Cygnus C. Cygnus, in Finland. 1973.
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Warning: These citations may not always be 100% accurate.