Correct.

And I saw in the right hand of Him who sat on the throne a book written inside and on the back, sealed up with seven seals. Revelation 5:1 (NAS)

In the Old Testament and New Testament times, they did not have books as we know them today.  Modern books consist of many individual pages of paper bound together with a seam and/or glue.  In the later Biblical times, books were written on a long continuous roll of parchment (animal skins), papyrus, or even metals such as copper wrapped around a pole.  In earlier Old Testament days, writings were carved on stone (such as the 10 Commandments), clay, metal, etc.

The word "book" in Revelation 5:1 is from the Greek word #975 "biblion" which means "a roll."  These rolls (or scrolls) were usually covered with a seal that would need to be broken in order to open the roll.

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