King, M. L., Warnock, R. G., & King, C. S. (2017). A gift of love: Sermons from Strength to love and other preachings. Penguin Books.
Citazione stile Chigago Style (17a edizione)King, Martin Luther, Raphael G. Warnock, e Coretta Scott King. A Gift of Love: Sermons from Strength to Love and Other Preachings. UK: Penguin Books, 2017.
Citatione MLA (8a ed.)King, Martin Luther, et al. A Gift of Love: Sermons from Strength to Love and Other Preachings. Penguin Books, 2017.
Attenzione: Queste citazioni potrebbero non essere precise al 100%.