Historica I; les sciences historiquea en tchecoslovaquie / Comite de Redaction by Josef Macek...[et al.]
Nakladatelstvi Ceskoslovenske Akademie Ved, 1962
 Buku Teks
Krug, Ronald S.
Behavioral sciences
Springer-Verlag, 1992
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Silverstein, Alvin
The biological sciences
Rinehart and Winston, 1974
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Weisz, Paul B.
The sciences of zoology
McGraw-Hill, 1975
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Krug, Ronald S.
Behavioral sciences
Springer-Verlag, 1992
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