APA-viite (7. p.)
United States Security Guards & Patrol Services Industry Capital & Expenses Report. C. Barnes & Co.
Chicago-viite (17. p.)
United States Security Guards & Patrol Services Industry Capital & Expenses Report. C. Barnes & Co.
MLA-viite (9. p.)
United States Security Guards & Patrol Services Industry Capital & Expenses Report. C. Barnes & Co.
Varoitus: Nämä viitteet eivät aina ole täysin luotettavia.