Drewry Shipping Consultants. (1987). Drewtank: Methodology and sample output. Drewery Shipping Consultans Ltd.
Cita Chicago Style (17a ed.)Drewry Shipping Consultants. Drewtank: Methodology and Sample Output. London: Drewery Shipping Consultans Ltd, 1987.
Cita MLA (9a ed.)Drewry Shipping Consultants. Drewtank: Methodology and Sample Output. Drewery Shipping Consultans Ltd, 1987.
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