Darwin, C., & Darwin, F. (2012). Charles Darwin: His Life in an Autobiographical Chapter, and in a Selected Series of His Published Letters. Project Gutenberg.
Chicago Style (17th ed.) CitationDarwin, Charles, and Francis Darwin. Charles Darwin: His Life in an Autobiographical Chapter, and in a Selected Series of His Published Letters. Project Gutenberg, 2012.
MLA (9th ed.) CitationDarwin, Charles, and Francis Darwin. Charles Darwin: His Life in an Autobiographical Chapter, and in a Selected Series of His Published Letters. Project Gutenberg, 2012.
Warning: These citations may not always be 100% accurate.