Ulrich's international periodicals directory 1991-1992 : volume 2
R.R. Bowker, 1991
 Buku Referensi
Ulrich's international periodicals directory 1992-1993 : volume 2
R.R. Bowker, 1992
 Buku Referensi
Ulrich's international periodicals directory 1990-1991 : volume 2
R. R. Bowker Company, 1990
 Buku Referensi
Ulrich's international periodicals directory 1992-1993 : volume 1
R.R. Bowker, 1992
 Buku Referensi
Ulrich's international periodicals directory 1991-1992 : volume 3
R.R. Bowker, 1991
 Buku Referensi
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