Cita APA (7th ed.)

Gumpel, H. J., & Boettcher, C. (1963). Taxation in the Federal Republic of Germany. Commerce Clearing House.

Cita Chicago (17th ed.)

Gumpel, Henry J., i Carl Boettcher. Taxation in the Federal Republic of Germany. Chicago: Commerce Clearing House, 1963.

Cita MLA (8th ed.)

Gumpel, Henry J., i Carl Boettcher. Taxation in the Federal Republic of Germany. Commerce Clearing House, 1963.