I need a list of states that allow initiatives and referenda and those that do not

Hello.

24 states have statewide initiative & referendum processes that allow
citizens to directly initiate and vote on a constitutional or
statutory amendment.

They are:

Alaska
Arizona
Arkansas
California
Colorado
Florida
Idaho
Illinois
Maine
Massachusetts
Michigan
Mississippi
Missouri
Montana
Nebraska
Nevada
North Dakota
Ohio
Oklahoma
Oregon
South Dakota
Utah
Washington
Wyoming

Sources:
Vote.org
http://www.vote.org/states.htm
Direct Democracy
http://groups.msn.com/DirectDemocracy/general.msnw?action=get_message&mview=1&ID_Message=7

Additionally, three states have a statewide process which allows
citizens "to gather petition signatures to refer a law passed by the
legislature to the voters; the law in question does not go into effect
until approved by the voters."
Those states are:

Kentucky
Maryland
New Mexico

Source: protecting animals/how the initiative process works:
http://www.api4animals.org/doc.asp?ID=738

 The remaining 23 states, which apparently do not have the statewide
initiative process, would be:

Alabama
Connecticut
Delaware
Georgia
Hawaii
Indiana
Iowa
Kansas
Louisiana
Minnesota
New Hampshire
New Jersey
New York
North Carolina
Pennsylvania
Rhode Island
South Carolina
Tennessee
Texas
Vermont
Virginia
West Virginia
Wisconsin

search strategy: "states that have," "initiative process"

I hope this helps.