The standard way is to mark the reference with a key number in the text. Then at the end of the essay, the key number appears in a list as, eg:
1. Smith, J., Basket Weaving for Beginners, Collins, 1998, p64.
ie. a very brief record of the book.
If your very next reference is for the same book, then you would put:
2. ibid, p90
Otherwise, you would cite the next book in the same way. If you then need to refer to the first book at 3., you may need to write it all out again, or you might get away with:
3. Smith, J., p106
After all these comes your bibliography. This is a list of all the books and other sources you have consulted for research, even if you haven't quoted them or actually referred to them in the text. They go in alphabetical order of author or editor. Eg:
Jones, B., Advanced Basket Weaving, Craft Publishers, Newastle, 2001.
There are different rules for citing broadcasts and recordings, but I'm not sure what they are.