Nilesh,
I don't know if anyone else responded to your query or if you managed to find the info you were looking for, but here's my attempt to try and answer as best as I can.
I presume you are looking at the different channels of sourcing, which are broadly classified as:
- Headhunters/HR consulting firms
- College/Campus recruitments
- Advertising and marketing - the ads in newspapers, radio jingles, etc
- Job portals - Naukri/Monster/Dice, etc
- Community portals - those irritating mass mailers on Orkut, Yahoo groups, etc :-)
- Tele-calling - an effective method to get some quick numbers and works best in a BPO setup
- Referrals and references - headhunting firms use this method, I don't see any reason an organization can't use it to meet its needs
- Social networking forums - college fairs, job fairs, exhibition grounds, religious seminars - a lot of consulting firms resort to this and manage to get in decent numbers that stand them in good stead
These are often methods that work well in volume hiring.
For levels above the associate level, it's best to use 2 options - the advertisement in a well-known national publication - Ascent or The Economic Times and/or a 3rd party - the headhunter - this provides the best ROI in relation to speed, quality, pre-screened profiles.