Mackin, R. (1969). Liberal Studies: Ronald Mackin, william F. Hawkins. Oxford u pr.
Chicago-čujuhus (17. p.)Mackin, Ronald. Liberal Studies: Ronald Mackin, William F. Hawkins. London: Oxford u pr, 1969.
MLA-čujuhus (9. p.)Mackin, Ronald. Liberal Studies: Ronald Mackin, William F. Hawkins. Oxford u pr, 1969.
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