Burant, Stephen R. 〈Appendix B: The Council for Mutual Economic Assistance〉. 《East Germany : a country study》(PDF). Washington, D.C.: Federal Research Division, Library of Congress. 300쪽. LCCN87600490.
lccn.loc.gov
Burant, Stephen R. 〈Appendix B: The Council for Mutual Economic Assistance〉. 《East Germany : a country study》(PDF). Washington, D.C.: Federal Research Division, Library of Congress. 300쪽. LCCN87600490.
