Cita APA (7th ed.)

Helman, P. (1986). Intermediate problem solving and data structures: Walls and mirrors. Cummings.

Cita Chicago (17th ed.)

Helman, Paul. Intermediate Problem Solving and Data Structures: Walls and Mirrors. Menlo Park, Calif: Cummings, 1986.

Cita MLA (9th ed.)

Helman, Paul. Intermediate Problem Solving and Data Structures: Walls and Mirrors. Cummings, 1986.