Stack, G. J. (1991). Kierkegaard's existential ethics (Reprint.). Gregg Revivals.
芝加哥风格引文Stack, George J. Kierkegaard's Existential Ethics. Reprint. Aldershot: Gregg Revivals, 1991.
MLA引文Stack, George J. Kierkegaard's Existential Ethics. Reprint. Gregg Revivals, 1991.
警告：这些引文格式不一定是100％准确.