APA-ийн эшлэл(7 дахь хэвлэлт)
Hubbard, F. W. (1931). Teacher Demand and suplly in the public elementary and secondary schools of the United States. The National Educ.Assoc.
Чикаго-гийн эшлэл (17 дахь хэвлэлт)
Hubbard, Frank William. Teacher Demand and Suplly in the Public Elementary and Secondary Schools of the United States. Washington: The National Educ.Assoc, 1931.
MLA -ийн эшлэл (9 дэх хэвлэлт)
Hubbard, Frank William. Teacher Demand and Suplly in the Public Elementary and Secondary Schools of the United States. The National Educ.Assoc, 1931.
Анхааруулга: Эдгээр ишлэлүүд үргэлж 100% үнэн зөв биш байж магадгүй.