Saxena, H.L.
Bulgaria under the red star / H.L. Saxena
S. Chand & Co, 1957
 Buku Teks
Konstitusi Bulgaria
editor, S. Prajudi Atmosudirdjo ...[et al.]
Ghalia Indonesia, 1987
 Buku Teks
R. Vassilev
Sociology in Bulgaria
Publishing House of the Bulgaria, 1970
 Buku Teks SO
Resnikoff, H.L.
Mathematics in civilization / by H.L. Resnikoff
Holt, Rinehart and Winston, 1973
 Buku Teks
Bakels. H.L.
Arbeids wetgeving / H.L. Bakels
Kluwer, 1982
 Buku Teks
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