APA Style

George, Robert T., Tollefsen, Christopher. (2008). Embryo : a defense of human life / Robert P. George and Christopher Tollefsen (1st ed.). USA: Doubleday.

Chicago Style

George, Robert T., Tollefsen, Christopher. Embryo : a defense of human life / Robert P. George and Christopher Tollefsen. 1st ed. USA: Doubleday, 2008. Text.

MLA Style

George, Robert T., Tollefsen, Christopher. Embryo : a defense of human life / Robert P. George and Christopher Tollefsen. 1st ed. USA: Doubleday, 2008. Text.

Turabian Style

George, Robert T., Tollefsen, Christopher. Embryo : a defense of human life / Robert P. George and Christopher Tollefsen. 1st ed. USA: Doubleday, 2008. Print.