What forms do I need to fill out to allow my daughter to travel from Switzerland to Bosnia via car with her aunt?

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They are called "Permission To Travel Consent" forms, here is the Internet link: http://www.myfamilytravels.com/how/advice/10545-Required-Documents-For-Travel-With-Minors.html?

Bosnia and Herzegovina immigration authorities strictly enforce a law requiring any unaccompanied minor (under 18) to have written permission from both parents in order to enter and leave the country. If traveling with only one parent, the minor is required to have written permission for the trip from the non-traveling parent. Hope that helps! !

You need a passport to travel to Bosnia. U.S. citizens do not need a visa for stays up to three months. The Government of Bosnia does not issue visas to U.S. travelers prior to travel for any length of stay. If you are not staying at a hotel (i.e. a private residence), you must register with the local police within 24 hours of arrival!