Cita APA (7th ed.)
YU-FENG, W., & ET AL. (1990). AN EPIDEMIOLOGICAL STUDY OF BEHAVIOUR PROBLEMS IN SCHOOL CHILDREN IN URBAN AREAS OF BEIJING.
Cita Chicago (17th ed.)
YU-FENG, W., i ET AL. AN EPIDEMIOLOGICAL STUDY OF BEHAVIOUR PROBLEMS IN SCHOOL CHILDREN IN URBAN AREAS OF BEIJING. 1990.
Cita MLA (9th ed.)
YU-FENG, W., i ET AL. AN EPIDEMIOLOGICAL STUDY OF BEHAVIOUR PROBLEMS IN SCHOOL CHILDREN IN URBAN AREAS OF BEIJING. 1990.
Atenció: Aquestes cites poden no estar 100% correctes.