Encyclopaedia Britannica, .
Britannica Book of the the Year / - 1st ed / - Chicago : Encyclopaedia Britannica, Inc.. - p.990 :
0-85229-428-X
N56,N85 / M5
Britannica Book of the the Year / - 1st ed / - Chicago : Encyclopaedia Britannica, Inc.. - p.990 :
0-85229-428-X
N56,N85 / M5