Burkhardt, R. W. (2019). Konrad lorenz. In Encyclopedia of Animal Behavior (pp. 109-114). Elsevier. https://doi.org/10.1016/B978-0-12-809633-8.01205-X

Burkhardt, R. W. (2019). Niko tinbergen. In Encyclopedia of Animal Behavior (pp. 128-134). Elsevier. https://doi.org/10.1016/B978-0-12-809633-8.01215-2

Burghardt, G. M., & Burkhardt, R. W. (2018). Wallace Craig's Appetites and Aversions as Constituents of Instincts: A Centennial appreciation. Journal of Comparative Psychology, 132(4), 361-372. https://doi.org/10.1037/com0000155

Burkhardt, R. W. (2018). An orangutan in Paris: pondering Proximity at the Muséum d’histoire naturelle in 1836. History and Philosophy of the Life Sciences, 40(1), [20]. https://doi.org/10.1007/s40656-018-0186-1

Burkhardt, R. W. (2016). Niko Tinbergen: A Message in the Archives. Journal of the History of Biology, 49(4), 685-703. https://doi.org/10.1007/s10739-016-9450-y

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