I sent my CV to a Professor regarding a PhD position. He asked me to send the name of three referees. I could have sent him the names, but here is an issue.
I have worked in Germany for 2 years as a research assistant and then I moved to my home country and worked here for almost 4 years and published papers in reputed journals. Logically I think I should include the names of my current supervisors or the supervisors I have published works with.
But the professor (I am applying to) is originally from Germany, currently residing in Canada. He asked me to include three referees from Germany. Is there any specific reason that he asked specifically for references from that country? Also, how do professors usually communicate? Do they call or send emails? Are they more comfortable if they are from the same country?