Littlefield, D. J. (1968). Twentieth century interpretations of The frogs; a collection of critical essays. Prentice-Hall.
芝加哥风格引文Littlefield, David J. Twentieth Century Interpretations of The Frogs; a Collection of Critical Essays. Englewood Cliffs, N. J: Prentice-Hall, 1968.
MLA引文Littlefield, David J. Twentieth Century Interpretations of The Frogs; a Collection of Critical Essays. Prentice-Hall, 1968.
警告：这些引文格式不一定是100％准确.