Thresholds in Education Foundation. Thresholds in education. [Thresholds in Education Foundation].
Chicago-viite (17. p.)Thresholds in Education Foundation. Thresholds in Education. [DeKalb, Ill.]: [Thresholds in Education Foundation].
MLA-viite (9. p.)Thresholds in Education Foundation. Thresholds in Education. [Thresholds in Education Foundation].
Varoitus: Nämä viitteet eivät aina ole täysin luotettavia.