Gaya APA
Merk, O., Dang, T, T. (2012).
Efficiency of world ports in container and bulk cargo (oil, coal, ores and grain) .
France:
OECD.
Gaya MLA
Merk, Olaf., Dang, Thai, Thanh.
"Efficiency of world ports in container and bulk cargo (oil, coal, ores and grain)".
France:
OECD,
2012.
Article.