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The following represents PFAN practice on recording sources of information in $u and $v in fields where they are defined, and/or in field 670:  
 
The following represents PFAN practice on recording sources of information in $u and $v in fields where they are defined, and/or in field 670:  
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<ol>
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<li>670s must be used to support information used as part of a heading in 1XX and 4XX fields.</li>
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1.670s must be used to support information used as part of a heading in 1XX and 4XX fields.
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<li>For fields 046, 368, 370-378, and 381:
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<ol>
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<li type="a">use of $v is optional if the same information/source is already cited in the 670</li>
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2.For fields 046, 368, 370-378, and 381:
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<li type="a">use $v if the information/source is not cited in a 670</li>
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a.use of $v is optional if the same information/source is already cited in the 670
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<li type="a">use of $u is optional, and should always be preceded by $v</li>
 
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</li>
b.use $v if the information/source is not cited in a 670
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</ol>
 
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</li>
c.use of $u is optional, and should always be preceded by $v
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</ol>
   
Use a 670 field if needed to justify information recorded in other fields for which subfields $u and/or $v are not defined or defined differently.  
 
Use a 670 field if needed to justify information recorded in other fields for which subfields $u and/or $v are not defined or defined differently.  
  
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