Websites of Spanish institutions 

• Presidency of the Government
• Ministry of Foreign Affairs and Cooperation
• Casa Asia
• Instituto Cervantes
• Agencia Estatal de Administración Tributaria
• Ministry of the Interior 
• Ministry of Education and Science

Websites of Singapore institutions

• Singapore Tourism Board
• Government
• Ministry of Foreign Affairs
• Inmigration and Customs Authority

Other websites of interest

• European Union
• Delegation of the European Commission in Singapore
• Asia Europe Foundation (ASEF)