Gumpel, H. J., & Boettcher, C. (1963). Taxation in the Federal Republic of Germany. Commerce Clearing House.
芝加哥风格引文Gumpel, Henry J., 与 Carl Boettcher. Taxation in the Federal Republic of Germany. Chicago: Commerce Clearing House, 1963.
MLA引文Gumpel, Henry J., 与 Carl Boettcher. Taxation in the Federal Republic of Germany. Commerce Clearing House, 1963.
警告：这些引文格式不一定是100％准确.