"On the Tendency of Species to form Varieties; and on the Perpetuation of Varieties and Species by Natural Means of Selection" adalah judul dari sebuah artikel jurnal, yang dibuat dan dihasilkan dari presentasi bersama dari dua makalah saintifik kepada Linnean Society of London pada 1 Juli 1858: On The Tendency of Varieties to Depart Indefinitely from the Original Type karya Alfred Russel Wallace dan Extract from an unpublished Work on Species dari Essay karya Charles Darwin tahun 1844. Artikel tersebut juga meliputi Abstract of a Letter dari Darwin kepada Asa Gray, dan sebuah surat pengenalan dari Joseph Dalton Hooker dan Charles Lyell.

Referensi

Text of On the Tendency of Species on Wikisource

• Browne, E. Janet (2002), Charles Darwin: vol. 2 The Power of Place, London: Jonathan Cape, ISBN 0-7126-6837-3 
• Darwin, Charles (1844), "Essay of 1844", dalam Darwin, Francis, The foundations of The origin of species: Two essays written in 1842 and 1844., Cambridge: Cambridge University Press, diakses tanggal 14 January 2007  (published 1909)
• Darwin, Charles; Wallace, Alfred Russel (1858), "On the Tendency of Species to form Varieties; and on the Perpetuation of Varieties and Species by Natural Means of Selection", Zoological Journal of the Linnean Society, 3: 46–62, doi:10.1111/j.1096-3642.1858.tb02500.x, diakses tanggal 14 January 2007 
• Darwin, Charles (1887), Darwin, F, ed., The life and letters of Charles Darwin, including an autobiographical chapter., London: John Murray  (The Autobiography of Charles Darwin) Retrieved on 2007-01-14
• Darwin, Charles (1958), Barlow, N, ed., The autobiography of Charles Darwin 1809–1882. With the original omissions restored. Edited and with appendix and notes by his grand-daughter Nora Barlow., London: Collins  (The Autobiography of Charles Darwin) Retrieved on 2006-12-15
• Desmond, Adrian; Moore, James (1991), Darwin, London: Michael Joseph, Penguin Group, ISBN 0-7181-3430-3 
• Keynes, Richard (ed.) (2000), "Specimen Lists", Charles Darwin's zoology notes & specimen lists from H.M.S. Beagle., Cambridge: Cambridge University Press Pemeliharaan CS1: Teks tambahan: authors list (link)