Need a good textbook for astrophysics

[achuthan1988]

i have 4 blocks of Astronomy and astrophysics in my course. Each block has 4 units ,so a total of 16 units/chapters.I am through with the first block and came across observational astronomy,types of telescopes,absolute/apparent modulus,virial theorem..A good reference textbook is what i need THANX in advance

 

[twofish-quant]

Look at Martin Harwit's "Astrophysical Concepts"

Also the Amazon page for that book as a lot of others that look interesting.