Gaya APA

Huggins, W., R., I, E, D. (). **Introductory systems and design . Massachusetts:: Massachusetts: Blaisdell; 1968.

Gaya MLA

Huggins, W.H.., R., I., Entwisle,, Doris. "**Introductory systems and design". Massachusetts:: Massachusetts: Blaisdell; 1968, . Text.