Reference: Pinkerton 1986

Pinkerton, Sandra. 1986. Quichean (Mayan) glottalized and nonglottalized stops: a phonetic study with implications for phonological universals. Experimental phonology 125. 139. Academic Press Orlando, FL.

@article{pinkerton1986quichean,
  author    = {Pinkerton, Sandra},
  journal   = {Experimental phonology},
  pages     = {139},
  publisher = {Academic Press Orlando, FL},
  title     = {Quichean (Mayan) glottalized and nonglottalized stops: a phonetic study with implications for phonological universals},
  volume    = {125},
  year      = {1986}
}