APA
Marel E. v. d., Shepherd Ben & World Bank. (2013). International tradability indices for services. Washington DC: World Bank.
Chicago
Marel Erik van der, Shepherd Ben and World Bank. 2013. International tradability indices for services. Washington DC: World Bank.
Harvard
Marel E. v. d., Shepherd Ben and World Bank. (2013). International tradability indices for services. Washington DC: World Bank.
MLA
Marel Erik van der, Shepherd Ben and World Bank. International tradability indices for services. Washington DC: World Bank. 2013.