Cita APA (7th ed.)

Helweg, O. J. (1991). Microcomputer applications in water resources. Prentice Hall.

Cita Chicago (17th ed.)

Helweg, Otto J. Microcomputer Applications in Water Resources. Englewood Cliffs, N.J.: Prentice Hall, 1991.

Cita MLA (8th ed.)

Helweg, Otto J. Microcomputer Applications in Water Resources. Prentice Hall, 1991.