Today my daughter and I were listening to directions in a children's course where the speaker said something like "[in the] student book"; I was not really sure about "in the" part. My daughter said the meaning of which "this is wrong! He should have said: ... the student's book". I didn't know what to say but this is okay.
I heard both but the problem is I don't know if there's any rule or it's arbitrary! This question was in mind long time ago but it's now or never.
By the way, what I am sure about is that the student's book has this phrase on the front cover "Student Book". So it's not plural just in case you might say what the speaker actually says is "in the students' book". It's a possibility but I really doubt it. It's very unlikely especially when I hear both "... the student book" and "... the student's book"
Could anyone enlighten me please?
Interested people could read this article: Happy "Veterans' Day," "Veteran's Day," or "Veterans Day"? Possessives vs. Attributive Nouns
Or this: Possessive Forms