New chances of ecotourism and educational tourism in neighbouring mountain regions of Poland, Germany, Czech Republic and Slovakia / Antonina Sebesta, Michał SICIŃSKI // W: EURO-ECO 2006 : 11\textsuperscript{th} international conference : interdisciplinary co-operation for the sustainable development of historical cities and protected areas perspectives of sound tourism : Kraków 18\textsuperscript{th}–19\textsuperscript{th} September 2006 / eds. Aleksandra Wagner, Jan W. Dobrowolski ; Katedra Biotechnologii Środowiskowej i Ekologii. — [Kraków : s. n.], [2006]. — Opis wg okł.. — S. 65–66

The philosophical idea of primary harmony and construction of idea of global sustainable development / M. SICIŃSKI // Polish Journal of Environmental Studies ; ISSN 1230-1485. — 2006 vol. 15 no. 5C, s. 17–20. — Bibliogr. s. 20. — EURO-ECO 2006 : 11th international conference : interdisciplinary co-operation for the sustainable development of historical cities and protected areas : perspectives of sound tourism : [Kraków 18th–19th September 2006]. — Olsztyn : HARD, 2006