Columbia subject headings:
Closed-end funds.
Mutual funds.
Real estate investment trusts.
Harvard subject headings:
Closed-end funds--Encyclopedias.
Closed-end funds.
Mutual funds--Encyclopedias.
Mutual funds.
Real estate investment trusts--Encyclopedias.
Real estate investment trusts.
Princeton subject headings:
Closed-end funds.
Mutual funds.
Real estate investment trusts.