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The 3 references without a DOI — listed, not checked
no DOI — not checkedBank for International Settlements. BIS Central Bank Survey of Foreign Exchange and Derivatives Market Activity: 1998. Basel: Bank for International Settlements, 1999.
no DOI — not checkedCuddington, J.T., and Liang, H. "Re-Examining the Purchasing Power Parity Hypothesis over Two Centuries." Working Paper, Georgetown University, Washington DC, May 6, 1998.
no DOI — not checkedU.S. Department of Energy. "Annual Energy Review." Energy Information Administration, Office of Energy Markets and End Use, Washington, DC, 2002.
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