https://web.archive.org/all/20060512150700/http:/www.hanoi-hotels-guide.com/hilton-opera.htm
Hilton Hanoi Opera Hotel, Hanoi - Discount Hilton Hanoi Opera Vietnam at Special Rate!
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https://web.archive.org/all/20051227144656/http:/www.hanoi-hotels-guide.com/hilton-opera.htm
Hilton Hanoi Opera Hotel, Hanoi - Discount Hilton Hanoi Opera Vietnam at Special Rate!
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https://thepointsguy.com/hotel/reviews/hotel-review-hilton-hanoi-opera/
Hotel Review: King Deluxe Room at the Hilton Hanoi Opera - The Points Guy
Nov 19, 2018 - The hotel's pricing was a steal, but there were major drawbacks, especially for a Hilton property. Read our review for all the details.
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