A co-op can decide to hire its own staff or use the services of a property-management company. (Note that some co-operatives in financial difficulty have an agreement with CMHC that requires them to use a property-management company.)
The Community Partners & Professional Service Providers every Board Needs 
Staff Management 
Maintenance Planning in your Housing Cooperative 
How to Market your Professional Services 
A Guide to Management Contracts 
1776 –Association Management Principles 
Tendering Guide 
Questions Cooperative Directors Should be Asking Management 
Property Management Company Evaluation Tool