Burkhardt, R. W. Darwin on animal behavior and evolution: Richard W. Burkhardt. The Darwinian heritage : [incl. proceed. of the Charles Darwin Centenary Conference, Florence Center for the History and Philosophy of Science, June 1982].(1985).
শিকাগো স্টাইল (17 তম সংস্করণ) উদ্ধৃতিBurkhardt, Richard W. "Darwin on Animal Behavior and Evolution: Richard W. Burkhardt." The Darwinian Heritage : [incl. Proceed. of the Charles Darwin Centenary Conference, Florence Center for the History and Philosophy of Science, June 1982].(1985) .
M.L.A (8 ম সংস্করণ) উদ্ধৃতিBurkhardt, Richard W. "Darwin on Animal Behavior and Evolution: Richard W. Burkhardt." The Darwinian Heritage : [incl. Proceed. of the Charles Darwin Centenary Conference, Florence Center for the History and Philosophy of Science, June 1982].(1985), .