Gray et al. 2015

Gray, Rachel, Hannah Paris, Daryl Pfantz, Dan Richardson & Juliann and Bullock. 2015. A Sociolinguistic Survey of the Yabong [ybo], Migum [klm], Nekgini [nkg], and Neko [nej] (SIL electronic survey reports (SILESR) 2015-005). Dallas, Texas: SIL International.

@misc{11541,
  author = {Gray and Rachel and Paris, Hannah and Pfantz, Daryl and Richardson, Dan and  and Bullock, Juliann},
  title  = {A Sociolinguistic Survey of the Yabong [ybo], Migum [klm], Nekgini [nkg], and Neko [nej] (SIL electronic survey reports (SILESR) 2015-005). Dallas, Texas: SIL International.},
  year   = {2015}
}