Weale, J. (1982). Tramp Shipping Arithmetic: The application of the programmable calculator to commercial problems. Fairplay Publications.
Παραπομπή σε μορφή Chicago (17η εκδ.)Weale, John. Tramp Shipping Arithmetic: The Application of the Programmable Calculator to Commercial Problems. London: Fairplay Publications, 1982.
Παραπομπή σε μορφή MLA (9th εκδ.)Weale, John. Tramp Shipping Arithmetic: The Application of the Programmable Calculator to Commercial Problems. Fairplay Publications, 1982.
Πρόσοχή: Οι παραπομπές μπορεί να μην είναι 100% ακριβείς.