Holder, L. (1997). Training and assessment on board: A guide for seafarers and managers on how to make best use of opportunities for practical training and assessment of competence on board ship (2nd ed.). Videotel Marine International Limited.
Παραπομπή σε μορφή Chicago (17η εκδ.)Holder, Len. Training and Assessment on Board: A Guide for Seafarers and Managers on How to Make Best Use of Opportunities for Practical Training and Assessment of Competence on Board Ship. 2nd ed. [s.l.]: Videotel Marine International Limited, 1997.
Παραπομπή σε μορφή MLA (9th εκδ.)Holder, Len. Training and Assessment on Board: A Guide for Seafarers and Managers on How to Make Best Use of Opportunities for Practical Training and Assessment of Competence on Board Ship. 2nd ed. Videotel Marine International Limited, 1997.