(1967). Programmed instruction; an international directory: L'enseignement programmé; un répertoire international / Compiled under the direction of Seth Spaulding [for UNESCO Secretariat.
Citazione stile Chigago Style (17a edizione)Programmed Instruction; an International Directory: L'enseignement Programmé; Un Répertoire International / Compiled Under the Direction of Seth Spaulding [for UNESCO Secretariat. 1967.
Citatione MLA (9a ed.)Programmed Instruction; an International Directory: L'enseignement Programmé; Un Répertoire International / Compiled Under the Direction of Seth Spaulding [for UNESCO Secretariat. 1967.
Attenzione: Queste citazioni potrebbero non essere precise al 100%.