Rf

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"Rf." The Oxford Pocket Dictionary of Current English. 2009. Encyclopedia.com. 30 May. 2012 <http://www.encyclopedia.com>.

"Rf." The Oxford Pocket Dictionary of Current English. 2009. Encyclopedia.com. (May 30, 2012). http://www.encyclopedia.com/doc/1O999-rf.html

"Rf." The Oxford Pocket Dictionary of Current English. 2009. Retrieved May 30, 2012 from Encyclopedia.com: http://www.encyclopedia.com/doc/1O999-rf.html

"Rf." The Columbia Encyclopedia, 6th ed.. 2011. Encyclopedia.com. 30 May. 2012 <http://www.encyclopedia.com>.

"Rf." The Columbia Encyclopedia, 6th ed.. 2011. Encyclopedia.com. (May 30, 2012). http://www.encyclopedia.com/doc/1E1-Rf.html

"Rf." The Columbia Encyclopedia, 6th ed.. 2011. Retrieved May 30, 2012 from Encyclopedia.com: http://www.encyclopedia.com/doc/1E1-Rf.html

"RF." A Dictionary of Nursing. 2008. Encyclopedia.com. 30 May. 2012 <http://www.encyclopedia.com>.

"RF." A Dictionary of Nursing. 2008. Encyclopedia.com. (May 30, 2012). http://www.encyclopedia.com/doc/1O62-RF.html

"RF." A Dictionary of Nursing. 2008. Retrieved May 30, 2012 from Encyclopedia.com: http://www.encyclopedia.com/doc/1O62-RF.html

MICHAEL KENNEDY and JOYCE BOURNE. "rf." The Concise Oxford Dictionary of Music. 1996. Encyclopedia.com. 30 May. 2012 <http://www.encyclopedia.com>.

MICHAEL KENNEDY and JOYCE BOURNE. "rf." The Concise Oxford Dictionary of Music. 1996. Encyclopedia.com. (May 30, 2012). http://www.encyclopedia.com/doc/1O76-rf.html

MICHAEL KENNEDY and JOYCE BOURNE. "rf." The Concise Oxford Dictionary of Music. 1996. Retrieved May 30, 2012 from Encyclopedia.com: http://www.encyclopedia.com/doc/1O76-rf.html

"RF." A Dictionary of Biology. 2004. Encyclopedia.com. 30 May. 2012 <http://www.encyclopedia.com>.

"RF." A Dictionary of Biology. 2004. Encyclopedia.com. (May 30, 2012). http://www.encyclopedia.com/doc/1O6-RF.html

"RF." A Dictionary of Biology. 2004. Retrieved May 30, 2012 from Encyclopedia.com: http://www.encyclopedia.com/doc/1O6-RF.html

FRAN ALEXANDER , PETER BLAIR , JOHN DAINTITH , ALICE GRANDISON , VALERIE ILLINGWORTH , ELIZABETH MARTIN , ANNE STIBBS , JUDY PEARSALL , and SARA TULLOCH. "rf." The Oxford Dictionary of Abbreviations. 1998. Encyclopedia.com. 30 May. 2012 <http://www.encyclopedia.com>.

FRAN ALEXANDER , PETER BLAIR , JOHN DAINTITH , ALICE GRANDISON , VALERIE ILLINGWORTH , ELIZABETH MARTIN , ANNE STIBBS , JUDY PEARSALL , and SARA TULLOCH. "rf." The Oxford Dictionary of Abbreviations. 1998. Encyclopedia.com. (May 30, 2012). http://www.encyclopedia.com/doc/1O25-rf.html

FRAN ALEXANDER , PETER BLAIR , JOHN DAINTITH , ALICE GRANDISON , VALERIE ILLINGWORTH , ELIZABETH MARTIN , ANNE STIBBS , JUDY PEARSALL , and SARA TULLOCH. "rf." The Oxford Dictionary of Abbreviations. 1998. Retrieved May 30, 2012 from Encyclopedia.com: http://www.encyclopedia.com/doc/1O25-rf.html