BIGG, W. W. (1972). Cost Accounts Walter W. Bigg. Macdonald & Evans Limited.
Lua i Stíl Chicago (17ú heag.)BIGG, Walter W. Cost Accounts Walter W. Bigg. Macdonald & Evans Limited, 1972.
Lua MLA (8ú heag.)BIGG, Walter W. Cost Accounts Walter W. Bigg. Macdonald & Evans Limited, 1972.
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