CAAS Manual of Standards - Air Traffic Services Version 1.0: 1 October 2009

http://www.caas.gov.sg/caasWeb/export/sites/caas/en/Regulations_And_Guidelines/Rules_and_Regulations/Aerodrome_ANS/Air_Traffic_Services_Information_Circular/downloads/MOS_ATS_v1_09.pdf?__locale=en

• Standards for ATC

IATA recommended practice 1630, cargo security

http://www.iata.org/nr/rdonlyres/ccb875f7-3968-47b0-a425-a75b691c626e/0/rp1630_adopted_csc31.pdf

Skybrary – Operations Manual

http://www.skybrary.aero/index.php/Operations_Manual
ICAO Annex 6: Operation of Aircraft contains procedures, guidance and instructions for use of operational personnel.

Perishables: Documentation and Labeling

http://en.lancargo.com/services/perishables/documentation-and-labeling/

Official Site for Aviation Common Taxonomies (ICAO/CAST)

http://www.intlaviationstandards.org/
website containing common taxonomies and definitions which establish a standard industry language thereby improving the quality of information and communication. With this common language the aviation community's capacity to focus on common safety issues is greatly enhanced.

ICAO ANNEXS 1-18

http://www.mediafire.com/?kwdj4jiadgy

Annex 1 to 18 all in one!

Singapore Statutes Online

http://statutes.agc.gov.sg/
Look up for Air Navigation Act, Carriage by Air Act, CAAS Act, Tokyo Convention Act etc. here.

CAAS Manual of Standards - Air Traffic Services Version 1.0: 1 October 2009

http://www.caas.gov.sg/caasWeb/export/sites/caas/en/Regulations_And_Guidelines/Rules_and_Regulations/Aerodrome_ANS/Air_Traffic_Services_Information_Circular/downloads/MOS_ATS_v1_09.pdf?__locale=en 
Standards for ATC

CAAS Air Operator Certificate

CAAS Air Operator Certificate

http://www.caas.gov.sg/caas/en/e-Services/Air_Operator_Certificate/?__locale=en

Setting up an Airline in Singapore.