Institute of Shipping Economics and Logistics (ISL). (1998). Shipping statistics yearbook 1998. Institute of Shipping Economics and Logistics (ISL).
Παραπομπή σε μορφή Chicago (17η εκδ.)Institute of Shipping Economics and Logistics (ISL). Shipping Statistics Yearbook 1998. Bremen: Institute of Shipping Economics and Logistics (ISL), 1998.
Παραπομπή σε μορφή MLA (9th εκδ.)Institute of Shipping Economics and Logistics (ISL). Shipping Statistics Yearbook 1998. Institute of Shipping Economics and Logistics (ISL), 1998.
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