Hays, J. W. (1913). How to cut your coal bill. A.W. Shaw Company.
Chicago-čujuhus (17. p.)Hays, Joseph W. How to Cut Your Coal Bill. London: A.W. Shaw Company, 1913.
MLA-čujuhus (9. p.)Hays, Joseph W. How to Cut Your Coal Bill. A.W. Shaw Company, 1913.
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