Cita APA (7th ed.)

HUGGINS, W., & ENTWISLE, D. R. (1968). Introductory systems and design. Blaisdell.

Cita Chicago (17th ed.)

HUGGINS, W.H, i Doris R. ENTWISLE. Introductory Systems and Design. Waltham: Blaisdell, 1968.

Cita MLA (9th ed.)

HUGGINS, W.H, i Doris R. ENTWISLE. Introductory Systems and Design. Blaisdell, 1968.