(1990). National Health Interview Survey, 1987 Adoption Supplement / United States Department of Health and Human Services. National Center for Health Statistics. [electronic resource].
Чикаго-гийн эшлэл (17 дахь хэвлэлт)National Health Interview Survey, 1987 Adoption Supplement / United States Department of Health and Human Services. National Center for Health Statistics. [electronic Resource]. 1990.
MLA -ийн эшлэл (9 дэх хэвлэлт)National Health Interview Survey, 1987 Adoption Supplement / United States Department of Health and Human Services. National Center for Health Statistics. [electronic Resource]. 1990.
Анхааруулга: Эдгээр ишлэлүүд үргэлж 100% үнэн зөв биш байж магадгүй.