1.
Ammonia – Wikipedia
en.wikipedia.org/wiki/Ammonia
2.
Ammonia – New World Encyclopedia
www.newworldencyclopedia.org/entry/Ammonia
3. 
The Facts About Ammonia
www.health.ny.gov/environmental/emergency/chemical_terrorism/ammonia_tech.htm
4.
Ammonia | NH3 – PubChem
pubchem.ncbi.nlm.nih.gov/compound/Ammonia
5.
ammonia | Definition & Uses | Britannica
www.britannica.com/science/ammonia
6.
Ammonia | US EPA
www.epa.gov/caddis-vol2/ammonia
7. 
Ammonia – an overview | ScienceDirect Topics
www.sciencedirect.com/topics/earth-and-planetary-sciences/ammonia
8.
Ammonia – American Chemical Society
www.acs.org/content/acs/en/molecule-of-the-week/archive/a/ammonia.html
9.
Ammonia – Sciencemadness Wiki
www.sciencemadness.org/smwiki/index.php/Ammonia
10.
Ammonia | Encyclopedia.com
www.encyclopedia.com/science-and-technology/chemistry/compounds-and-elements/ammonia
11. 
all you need to know about ammonia and its properties
freechemistryonline.com/ammonia-properties.html
Conclusion
Guide above should be useful for Ammonia’s Unusually High Melting Point Is The Result Of.