Engstrom, T. W. (1985). The fine art of friendship: Building and maintaining quality relationships. Thomas Nelson.
芝加哥风格引文Engstrom, Ted W. The Fine Art of Friendship: Building and Maintaining Quality Relationships. Nashville: Thomas Nelson, 1985.
MLA引文Engstrom, Ted W. The Fine Art of Friendship: Building and Maintaining Quality Relationships. Thomas Nelson, 1985.
警告：这些引文格式不一定是100％准确.