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I am writing a thesis on ultrasonic measurement, but now i need to know the speed of sound in different materials, like petroleum oil and parafinnic wax(deposited from crude oil). Is there anyone who can give me a link where I can find these values?

The Speed of Sound in various liquids will vary, according to its temperature, pressure, density and cavitation.
One method might be, to get hold of an Ultrasonic Cleaner. Stick an additional Piezo electric transducer onto one side. Single pulse the Cleaner, with both transducers connected to a very fast dual trace Oscilloscope. Thus measuring the pulse/echo return.
A more simplistic idea would be:-
Stick two piezo transducers into opposite ends of a long glass tank. To prevent pulse/reflective overlap (for ease of measuring) use the shortest pulse possible. Simply discharging a small capacitor into your 'transmitting' transducer might work?
Get your University boffins to help out, it could turn out to be an interesting project.

The only way to know for a given sample of indeterminate composition is to ping it, measure time delay of propagation, and find out. Are they dispersive media for propagation vs. frequency? Does amplitude matter? Look at the densities of liquid and solid paraffin. A highly compressible medium will have its properties depend on temperature and depth.

Are the media inhomogeneous over the distance of a wavelength or more? Are there particulates to cause scattering? Is there composition stratification?