リファレンスブックだろう
rifarensubukkudarō
1. Reference book, probably.; It's likely a reference book.
Noun
#2921879
1. Reference book, probably.; It's likely a reference book.
1. book
1. seems; I think
2. right?; don't you agree?
1. Probably okay.; It'll probably be alright.
1. of book; book’s
1. With a book; By book
1. It is a book.; Is a book.
1. Unfortunately likely.; Probably regrettable.
1. Not quite.; Probably not.
1. How old could they be?; Probably around… (age)