1
by de Graaf, H.
Published 1954
Brill

3
by de Graaf, H.
Published 1961
Brill

4
by de Graaf, H.
Published 1962
Brill

5
by de Graaf, H.J., Musters, C.J., Ter Keurs, W.J.
Published 1999
Springer Netherlands

6
by Pigeaud, T.G.
Published 1976
Brill
Other Authors: '; ...de Graaf, H....

7
by Pigeaud, T.G.
Published 1974
Brill
Other Authors: '; ...de Graaf, H....

8 Other Authors: '; ...de Graaf, H.J....

9
by van der Wal, H.
Published 1985
WRR
Other Authors: '; ...de Graaf, H.J....