BOWE, F. (1991). NATIONAL SURVEY ON TELEPHONE SERVICES AND PRODUCTS.
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Chicago-čujuhus (17. p.)
BOWE, F.G. NATIONAL SURVEY ON TELEPHONE SERVICES AND PRODUCTS. 1991.
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MLA-čujuhus (9. p.)
BOWE, F.G. NATIONAL SURVEY ON TELEPHONE SERVICES AND PRODUCTS. 1991.
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