Gerlach, V. S. (1971). Teaching and media: A systematic approach. Prentice-Hall.
芝加哥风格引文Gerlach, Vernon S. Teaching and Media: A Systematic Approach. Englewood Cliffs: Prentice-Hall, 1971.
MLA引文Gerlach, Vernon S. Teaching and Media: A Systematic Approach. Prentice-Hall, 1971.
警告：这些引文格式不一定是100％准确.