(1971). "Countdown to the 70's." Occupational Information for Upper Elementary and Middle Grades.
Citazione stile Chigago Style (17a edizione)"Countdown to the 70's." Occupational Information for Upper Elementary and Middle Grades. 1971.
Citatione MLA (9a ed.)"Countdown to the 70's." Occupational Information for Upper Elementary and Middle Grades. 1971.
Attenzione: Queste citazioni potrebbero non essere precise al 100%.