APA
WHO, . (1990). Guidelines for counselling about HIV infection and disease. Geneva: World Health Organization.
Chicago
WHO, . 1990. Guidelines for counselling about HIV infection and disease. Geneva: World Health Organization.
Harvard
WHO, . (1990). Guidelines for counselling about HIV infection and disease. Geneva: World Health Organization.
MLA
WHO, . Guidelines for counselling about HIV infection and disease. Geneva: World Health Organization. 1990.