国際こくさい標準ひょうじゅん図書としょ番号ばんごうだったら
kokusaihyōjuntoshobangōdattara

Noun
Da Copula

The "-tara" conditional form ("if/when…") of 国際標準図書番号

1. if it were the International Standard Book Number; if the International Standard Book Number were

Tara Conditional