Thank you brother so nice of you. I just need to know what type of proof I need to provide them other than colleagues references if I have worked in any country other than my home country?Your circumstances are unique and I think you need to talk to APEGA about your case. APEGA has a dedicated International Qualifications Officer (IQA) and you can discuss your case with him.
Regarding experience, you don't need letter from employer. Any colleague or senior from that organization can provider reference for work in that organization. I can understand some employers HR back home are pathetic when it comes to providing a work reference.