your ex-colleague? your landlord? your dentist?Asking for references and guarantor even though the application has a citizenship certificate that is given by the government, has an ID copy that is given by government, shows that IRCC does not trust itself nor the system. In reality, in 3 years you can really know someone very well for 2 years.. especially in Vancouver can't even make friends let alone finding a person to be a reference for a passport application.
I don't have anyone so I will send that section empty.