Gregg, J. R., & Leslie, L. A. (1964). Gregg speed building. McGraw - Hill.
Chicago-čujuhus (17. p.)Gregg, John R., juo Louis A. Leslie. Gregg Speed Building. New York: McGraw - Hill, 1964.
MLA-čujuhus (9. p.)Gregg, John R., juo Louis A. Leslie. Gregg Speed Building. McGraw - Hill, 1964.
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