Christophersen, P. (1973). Second-language learning; myth and reality. Penguin Education.
Citazione stile Chigago Style (17a edizione)Christophersen, Paul. Second-language Learning; Myth and Reality. Harmondsworth: Penguin Education, 1973.
Citatione MLA (8a ed.)Christophersen, Paul. Second-language Learning; Myth and Reality. Penguin Education, 1973.
Attenzione: Queste citazioni potrebbero non essere precise al 100%.