Estók Bertalan and Milinki Éva: Changes in the quality of water in Laskó stream and the storage lake built on it at Egerszalók. In: Tiscia 24. pp. 11-22. (1989)
Estók Bertalan: Fecal indicator bacteria of the sediment in the Tisza and at the mouth of its greatest tributaries = Fekál indikátor baktériumok vizsgálata a Tisza hossz-szelvényében és a jelentősebb mellékfolyók torkolatának üledékében. In: Tiscia 16. pp. 75-82. (1981)
Estók Bertalan: Sediment investigations carried out in the longitudinal section of the Tisza and in the mouth of its major tributaries for establishing the presence of Faecalindicator bacteria. In: Tiscia 15. pp. 27-34. (1980)
Estók Bertalan and Andrik Péter: The bacteriological investigation of the Tisza in the stretch between Cigánd and Kisköre in 1975. In: Tiscia 12. pp. 11-15. (1977)