Implement a Lisp macro system

/prog/, do you know of a tutorial or a paper on implementing a Lisp macro system from scratch? It could be Scheme macros, it could be really simple macros, anything would be helpful.

[Macro]

defmacro name lambda-list [[ {declaration}* | doc-string ]] {form}*

defmacro is a macro-defining macro that arranges to decompose the macro-call form in an elegant and useful way. defmacro has essentially the same syntax as defun: name is the symbol whose macro definition we are creating, lambda-list is similar in form to a lambda-list, and the forms constitute the body of the expander function. The defmacro construct arranges to install this expander function, as the global macro definition of name.