Harvard:
Chang, K. and Chang, B.S. xxxx, "Spoken Tibetan texts",
APA:
Chang, K. and Chang, B.S. (xxxx). Spoken Tibetan texts. .
Chicago:
Chang, Kun and Betty Shefts Chang. xxxx. "Spoken Tibetan Texts." .
MLA:
Chang, Kun and Betty Shefts Chang. "Spoken Tibetan Texts." (xxxx): .
Citation within the text:
(Chang & Chang xxxx)
Zotero:
Save reference in Zotero
BibTeX:
@article{changxxxxspoken,
  title = {Spoken Tibetan texts},
  author = {CHANG, Kun and CHANG, Betty Shefts},
  year = {xxxx},
  address = {Special publication, 74},
  keywords = {Tibet;Language},
  x-extra = {Special publication, 74},
  BAS = {118535},
  source = {bas},
}