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Pettit, R., 2006. The Directory Publishers Association. Serials, 7(1), pp.57–59. DOI: http://doi.org/10.1629/070157
Pettit R. The Directory Publishers Association. Serials. 2006;7(1):57–9. DOI: http://doi.org/10.1629/070157
Pettit, R. (2006). The Directory Publishers Association. Serials, 7(1), 57–59. DOI: http://doi.org/10.1629/070157
Pettit R, ‘The Directory Publishers Association’ (2006) 7 Serials 57 DOI: http://doi.org/10.1629/070157
