Gruber, H. E. Going to the limit: Toward the construction of Darwin's theory (1832-1839) / Howard E. Gruber. The Darwinian heritage : [incl. proceed. of the Charles Darwin Centenary Conference, Florence Center for the History and Philosophy of Science, June 1982].(1985).
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रGruber, Howard E. "Going to the Limit: Toward the Construction of Darwin's Theory (1832-1839) / Howard E. Gruber." The Darwinian Heritage : [incl. Proceed. of the Charles Darwin Centenary Conference, Florence Center for the History and Philosophy of Science, June 1982].(1985) .
एमएलए (8वां संस्करण) प्रशस्ति पत्रGruber, Howard E. "Going to the Limit: Toward the Construction of Darwin's Theory (1832-1839) / Howard E. Gruber." The Darwinian Heritage : [incl. Proceed. of the Charles Darwin Centenary Conference, Florence Center for the History and Philosophy of Science, June 1982].(1985), .