Duncker, K. (1945). On problem-solving. American Psychological Association.
芝加哥风格引文Duncker, Karl. On Problem-solving. Washington, D.C.: American Psychological Association, 1945.
MLA引文Duncker, Karl. On Problem-solving. American Psychological Association, 1945.
警告：这些引文格式不一定是100％准确.