APA-čujuhus (7. p.)
Krug, M. M. (1972). What will be taught-the next decade.
Chicago-čujuhus (17. p.)
Krug, Mark M. What Will Be Taught-the Next Decade. 1972.
MLA-čujuhus (9. p.)
Krug, Mark M. What Will Be Taught-the Next Decade. 1972.
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