Heathkit Educational Systems. (1981). Digital techniques: Student workbook. Heath Company.
Citazione stile Chigago Style (17a edizione)Heathkit Educational Systems. Digital Techniques: Student Workbook. Benton Harbor, Mich: Heath Company, 1981.
Citatione MLA (9a ed.)Heathkit Educational Systems. Digital Techniques: Student Workbook. Heath Company, 1981.
Attenzione: Queste citazioni potrebbero non essere precise al 100%.