McKnight, T. L., & Lindgren, P. C. (1990). Physical geography: A landscape appreciation (3rd ed.). Prentice-Hall.
芝加哥风格引文McKnight, Tom L., 与 Patricia Caldwell Lindgren. Physical Geography: A Landscape Appreciation. 3rd ed. Englewood Cliffs, N.J: Prentice-Hall, 1990.
MLA引文McKnight, Tom L., 与 Patricia Caldwell Lindgren. Physical Geography: A Landscape Appreciation. 3rd ed. Prentice-Hall, 1990.
警告：这些引文格式不一定是100％准确.