Dietrich, W., & Cunningham, B. (2003). Natural grace: The charm, wonder, and lessons of Pacific Northwest animals and plants. University of Washington Press.
Citace podle Chicago (17th ed.)Dietrich, William, a Brenda Cunningham. Natural Grace: The Charm, Wonder, and Lessons of Pacific Northwest Animals and Plants. Seattle, Washington ; London, England: University of Washington Press, 2003.
Citace podle MLA (9th ed.)Dietrich, William, a Brenda Cunningham. Natural Grace: The Charm, Wonder, and Lessons of Pacific Northwest Animals and Plants. University of Washington Press, 2003.
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