parents visit Canada for a week need visa?

please help! I Will take my parents to visit Canada about a week after Alaska Cruise. Do they need visa to Canada? I remember if within 30 days, ttourist with USA visa doesn't need visa to Canada. is that true? besides, we are green card holder. do we need Canada visa? our cruise will stop by a canada port. do we need Canada visa for that port? thank you for your help.

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Yes. -863211- 给 863211 发送悄悄话 863211 的博客首页 (538 bytes) () 02/22/2013 postreply 10:15:04

thank you so much, what about us GC holder? need visa? -handinhand- 给 handinhand 发送悄悄话 (0 bytes) () 02/22/2013 postreply 13:10:51

回复:thank you so much, what about us GC holder? need visa? -863211- 给 863211 发送悄悄话 863211 的博客首页 (72 bytes) () 02/22/2013 postreply 14:02:28

thank you so much! -handinhand- 给 handinhand 发送悄悄话 (0 bytes) () 02/23/2013 postreply 10:45:29

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