President Reagan, the target of embarrassing disclosures in books by former aides, says he probably will write a book of his own to ``straighten out the record and tell things as they really are.'' However, the president indicated he wasn't happy about the idea. ``I don't look forward to it. I wrote a book once and found it was quite a chore,'' said Reagan, the author of a 1965 autobiography entitled ``Where's the Rest of Me.'' Reagan revealed his plans in a televised interview with two Soviet journalists, broadcast Saturday night in the Soviet Union after being taped last week in the Oval Office. ``I've been thinking very seriously about writing a book. In view of the fact that several people who have left government have written some books, I think maybe I better straighten out the record and tell things as they really are,'' Reagan said. He said the presidential library to be built in southern California after he leaves office will house the papers and memorabilia that he collected. ``So there will be a record that is open for public view. But I'll probably get around to writing a book.'' ``For the Record,'' a recent book by former White House chief of staff Donald T. Regan, portrayed Reagan as a hand-off leader whose schedule was guided by astrological forecasts followed by his wife, Nancy. Former White House spokesman Larry Speakes also drew an unflattering portrait of Reagan in his book, ``Speaking Out,'' and said he made up quotes for the president at the Geneva summit with Gorbachev because Reagan was losing the public relations battle. Speakes said he also took words from Secretary of State George P. Shultz and attributed them to Reagan after the Soviet Union shot down a Korean airliner. Speakes said Reagan didn't have anything to say on his own at meetings with key aides.