Sloan, P. R. Darwin's Invertebrate program, 1826-1836: Preconditions for transformism / Phillip R. Sloan. The Darwinian heritage : [incl. proceed. of the Charles Darwin Centenary Conference, Florence Center for the History and Philosophy of Science, June 1982].(1985).
Chicago-viite (17. p.)Sloan, Phillip R. "Darwin's Invertebrate Program, 1826-1836: Preconditions for Transformism / Phillip R. Sloan." The Darwinian Heritage : [incl. Proceed. of the Charles Darwin Centenary Conference, Florence Center for the History and Philosophy of Science, June 1982].(1985) .
MLA-viite (8. p.)Sloan, Phillip R. "Darwin's Invertebrate Program, 1826-1836: Preconditions for Transformism / Phillip R. Sloan." The Darwinian Heritage : [incl. Proceed. of the Charles Darwin Centenary Conference, Florence Center for the History and Philosophy of Science, June 1982].(1985), .