Gale, F. L. (1975). Determining the requirements for the design of learner-based instruction. Merrill.
Lua i Stíl Chicago (17ú heag.)Gale, Fred L. Determining the Requirements for the Design of Learner-based Instruction. Columbus, Ohio: Merrill, 1975.
Lua MLA (9ú heag.)Gale, Fred L. Determining the Requirements for the Design of Learner-based Instruction. Merrill, 1975.
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