MLA
Walker, Alexander, 1779-1852. Intermarriage, or, The mode in which and the causes why, beauty, health and intellect, result from certain unions, and deformity, disease and insanity from others : demonstrated by delineation of the structure and forms, and descriptions of the functions and capacities, which each parent, in every pair, bestows on children-in conformity with certain natural laws, and by an account of corresponding effects in the breeding of animals, with eight illustrative drawings. 1866. Medical Heritage Imprints Collection . Robert W. Woodruff Health Sciences Center. Library. https://digital.library.emory.edu/purl/948sbcc5sp-cor.
APA, 6th edition
Walker, Alexander, 1779-1852. (1866)[Intermarriage, or, The mode in which and the causes why, beauty, health and intellect, result from certain unions, and deformity, disease and insanity from others : demonstrated by delineation of the structure and forms, and descriptions of the functions and capacities, which each parent, in every pair, bestows on children-in conformity with certain natural laws, and by an account of corresponding effects in the breeding of animals, with eight illustrative drawings]. Medical Heritage Imprints Collection , Robert W. Woodruff Health Sciences Center. Library. https://digital.library.emory.edu/purl/948sbcc5sp-cor.
Chicago
Walker, Alexander, 1779-1852, Intermarriage, or, The mode in which and the causes why, beauty, health and intellect, result from certain unions, and deformity, disease and insanity from others : demonstrated by delineation of the structure and forms, and descriptions of the functions and capacities, which each parent, in every pair, bestows on children-in conformity with certain natural laws, and by an account of corresponding effects in the breeding of animals, with eight illustrative drawings, 1866, Medical Heritage Imprints Collection , Robert W. Woodruff Health Sciences Center. Library. https://digital.library.emory.edu/purl/948sbcc5sp-cor.