ERIC Clearinghouse for Junior Colleges & Cohen, A. M. (1971). A Constant variable. Jossey-Bass.
Citazione stile Chigago Style (17a edizione)ERIC Clearinghouse for Junior Colleges e Arthur M. Cohen. A Constant Variable. San Francisco, Calif: Jossey-Bass, 1971.
Citatione MLA (9a ed.)ERIC Clearinghouse for Junior Colleges e Arthur M. Cohen. A Constant Variable. Jossey-Bass, 1971.
Attenzione: Queste citazioni potrebbero non essere precise al 100%.