Lopker, J. (2000). Pictures of personality: Guide to the four human natures (First edition.). Typology.
芝加哥风格引文Lopker, John. Pictures of Personality: Guide to the Four Human Natures. First edition. Los Angeles, CA: Typology, 2000.
MLA引文Lopker, John. Pictures of Personality: Guide to the Four Human Natures. First edition. Typology, 2000.
警告：这些引文格式不一定是100％准确.