APA-čujuhus (7. p.)

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

Chicago-čujuhus (17. p.)

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

MLA-čujuhus (9. p.)

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

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