| #1001 | OECD. Economic outlook. -- Paris : OECD, 1967-. -- ISSN 0474-5574 print. -- ISSN 1609-7408 online |
| #1002 | OECD economic surveys. -- Paris : OECD, 1961-. -- ISSN 0376-6438 print. -- ISSN 1609-7513 online |
| #1003 | OECD observer. -- Paris : Organisation for Economic Co-operation and Development, 1962-. -- ISSN 0029-7054 print. -- ISSN 1561-5529 online |
| #1004 | Oil and energy trends. -- Reading : Energy Economics Research, 1975-. -- ISSN 0950-1045 print. -- ISSN 1744-7992 online |
| #1005 | Oman infrastructure report. -- London : Business Monitor International, 2005-. -- ISSN 1752-7856 |
| #1006 | Omega. -- Oxford : Pergamon, 1973-. -- ISSN 0305-0483 print. -- ISSN 1873-5274 online |
| #1007 | Operational research. -- Berlin : Springer, 2001-. -- ISSN 1109-2858 print. -- ISSN 1866-1505 online |
| #1008 | Operational research quarterly. -- Oxford : Pergamon Press, 1970-1977. -- ISSN 0030-3623 |
| #1009 | Operations management research. -- New York : Springer New York, 2008-. -- ISSN 1936-9735 print. -- ISSN 1936-9743 online |
| #1010 | Optimization Letters. -- : Springer, 2007-. -- ISSN 1862-4472 print. -- ISSN 1862-4480 online |