APA-ийн эшлэл(7 дахь хэвлэлт)

HOPPOCK, R. (1967). Occupational information: Where to get it and how touse it in counseling and in teaching.-- Ed.3. McGraw-Hill.

Чикаго-гийн эшлэл (17 дахь хэвлэлт)

HOPPOCK, Robert. Occupational Information: Where to Get It and How Touse It in Counseling and in Teaching.-- Ed.3. New York: McGraw-Hill, 1967.

MLA -ийн эшлэл (9 дэх хэвлэлт)

HOPPOCK, Robert. Occupational Information: Where to Get It and How Touse It in Counseling and in Teaching.-- Ed.3. McGraw-Hill, 1967.