Columbia subject headings:
Document delivery--Periodicals.
Interlibrary loans--Periodicals.
Library information networks--Periodicals.
Harvard subject headings:
Document delivery--Periodicals.
Interlibrary loans--Periodicals.
Library information networks--Periodicals.
Princeton subject headings:
Document delivery--Periodicals.
Interlibrary loans--Periodicals.
Library information networks--Periodicals.
Periodicals.