Trích dẫn APA

Kierkegaard, S. (1948). Purity of heart is to will one thing: Spiritual preparation for the office of confession. London: Fontana Books.

Trích dẫn kiểu Chicago

Kierkegaard, Søren. Purity of Heart Is to Will One Thing: Spiritual Preparation for the Office of Confession. London: Fontana Books, 1948.

Trích dẫn MLA

Kierkegaard, Søren. Purity of Heart Is to Will One Thing: Spiritual Preparation for the Office of Confession. London: Fontana Books, 1948.

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