APA

Grant P. R. G. B. R., . (2000). Non-random fitness variation in two populations of Darwin's finches. : .

Chicago

Grant P R Grant B R, . 2000. Non-random fitness variation in two populations of Darwin's finches. : .

Harvard

Grant P. R. G. B. R., . (2000). Non-random fitness variation in two populations of Darwin's finches. : .

MLA

Grant P R Grant B R, . Non-random fitness variation in two populations of Darwin's finches. : . 2000.