APA-ийн эшлэл(7 дахь хэвлэлт)

Barr, A., & Packard, T. (2005). Seeking solutions to vulnerability in old age: Preferences, constraints, and alternatives for coverage under Peru’s pension system. CSAE (University of Oxford).

Чикаго-гийн эшлэл (17 дахь хэвлэлт)

Barr, A., ба T. Packard. Seeking Solutions to Vulnerability in Old Age: Preferences, Constraints, and Alternatives for Coverage Under Peru’s Pension System. CSAE (University of Oxford), 2005.

MLA -ийн эшлэл (9 дэх хэвлэлт)

Barr, A., ба T. Packard. Seeking Solutions to Vulnerability in Old Age: Preferences, Constraints, and Alternatives for Coverage Under Peru’s Pension System. CSAE (University of Oxford), 2005.