reference substance reference substances reference surface reference symbol reference symbols reference system reference systems reference table reference tables reference temperature reference terminal reference test reference text reference texts reference thereto reference time reference to annex reference to article reference to committee reference to examples reference to existing reference to fig reference to figure reference to figures reference to footnote reference to formula reference to god reference to him reference to human reference to international reference to it reference to jesus reference to local reference to me reference to national reference to new reference to one reference to paragraph reference to related reference to relevant reference to something reference to table reference to the appended reference to the fact reference to the film reference to the movie reference to the use reference to what reference tool reference tools reference type reference types reference unit reference used reference value reference value can reference values reference vector reference video reference voltage reference voltage v reference voltages reference wage reference was made reference wave reference wavelength reference we reference website reference week reference weight reference when reference will reference will be made reference work reference works reference would reference year reference years reference zone referenced referenced here referenced herein referenced it references references and links references and resources references and sources references are available references are cited references are given references are made references are not references are provided references are used references at the end references available references can references can be found references cited