Weale, J. (1982). Tramp shipping arithmetic: The application of the programmable calculator to commercial problems. Fairplay.
Чикаго-гийн эшлэл (17 дахь хэвлэлт)Weale, John. Tramp Shipping Arithmetic: The Application of the Programmable Calculator to Commercial Problems. Londres: Fairplay, 1982.
MLA -ийн эшлэл (9 дэх хэвлэлт)Weale, John. Tramp Shipping Arithmetic: The Application of the Programmable Calculator to Commercial Problems. Fairplay, 1982.
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