International Union of Crystallography
www.iucr.org
Website of International Union of Crystallography – journals, monographs, International Tables for Crystallography, dictionaries and educational materials, online-service for checking the investigated structures on cif-files, the most complete catalogue of databases and software in the physics and chemistry of solid state.

The International Centre for Diffraction Data (ICDD)
www.icdd.com
Website of The International Centre for Diffraction Data (ICDD) – the leading organization in the field of X-ray powder diffraction. Newest investigations, journals, educational materials, programs and Grants-in-Aid.

The Collaborative Computational Project (CCP14)
www.ccp14.ac.uk
Website of software engineers for structural analysis. Educational materials, catalogue of freely available programs for academic users.

STOE & Cie GmbH
www.stoe.com
Website of STOE company - one of the leading world producers of equipment for X-ray investigations, supplier of the "Interfaculty scientific-educational laboratory of X-ray structure analysis".

X-ray crystallography in Wikipedia
en.wikipedia.org/wiki/X-ray_crystallography
X-ray crystallography in Wikipedia – scientific-popular notes about the crystal structure determination by X-ray methods.

Collection of X-ray lamps
xraylamp.webd.pl
Collection of X-ray lamps: all about X-ray tubes

Services of scientific periodicals, search of information
science-direct.com
search.ebscohost.com
www.scirus.com
isiwebofknowledge.com
www.rsc.org
interscience.wiley.com/search
pubs.acs.org/search
iop.org/EJ/search