Cofer, C. N. (1972). Programmed learning aid for introduction to psychology. Learning systems co..
芝加哥风格引文Cofer, Charles N. Programmed Learning Aid for Introduction to Psychology. Illinois: Learning systems co., 1972.
MLA引文Cofer, Charles N. Programmed Learning Aid for Introduction to Psychology. Learning systems co., 1972.
警告：这些引文格式不一定是100％准确.