Geddes, Alistair, Parker, Charlie ORCID: https://orcid.org/0000-0002-4569-7580 and Scott, Sam 
ORCID: https://orcid.org/0000-0002-5951-4749
  
(2018)
When the snowball fails to roll and the use of ‘horizontal’ networking in qualitative social research.
    International Journal of Social Research Methodology, 21 (3).
     pp. 347-358.
     doi:10.1080/13645579.2017.1406219