APA-ийн эшлэл(7 дахь хэвлэлт)

Knowles, R. (2005). 150 contractual problems and their solutions. Blackwell Pub..

Чикаго-гийн эшлэл (17 дахь хэвлэлт)

Knowles, Roger. 150 Contractual Problems and Their Solutions. Oxford ; Malden, MA: Blackwell Pub., 2005.

MLA -ийн эшлэл (9 дэх хэвлэлт)

Knowles, Roger. 150 Contractual Problems and Their Solutions. Blackwell Pub., 2005.