APA
Merrill S., Grofman B., . (1999). A unified theory of voting: Directional and proximity spatia. Cambridge: Cambridge Uni Pr.
Chicago
Merrill Samuel, Grofman Bernard, . 1999. A unified theory of voting: Directional and proximity spatia. Cambridge: Cambridge Uni Pr.
Harvard
Merrill S., Grofman B., . (1999). A unified theory of voting: Directional and proximity spatia. Cambridge: Cambridge Uni Pr.
MLA
Merrill Samuel, Grofman Bernard, . A unified theory of voting: Directional and proximity spatia. Cambridge: Cambridge Uni Pr. 1999.