APA Format
World Health Organization
. (1977,1987,1997). Oral health survey : basic methods. Geneva : WHO
MLA Format
World Health Organization
. Oral health survey : basic methods. Geneva : WHO, 1977,1987,1997
Australian/Harvard Format
World Health Organization
. 1977,1987,1997. Oral health survey : basic methods. WHO, Geneva
Warning: These citations may not always be 100% accurate.