Cita APA (7th ed.)

Helmers, F. L. C. H. (1979). Project planning and income distribution. M. Nijhoff.

Cita Chicago (17th ed.)

Helmers, F. Leslie C. H. Project Planning and Income Distribution. Boston: M. Nijhoff, 1979.

Cita MLA (9th ed.)

Helmers, F. Leslie C. H. Project Planning and Income Distribution. M. Nijhoff, 1979.