refereed journal refereed journals refereeing referees referees have referees must referees should reference référence reference again reference also reference amount reference amounts reference and research reference angle reference antibody reference approach reference architecture reference area reference areas reference article reference axes reference axis reference back reference base reference beam reference being made reference bible reference block reference blocks reference book reference books reference brand reference can reference can be made reference card reference case reference category reference cell reference center reference centers reference centre reference centres reference channel reference character reference characters reference chart reference check reference checks reference circuit reference cited reference class reference clients reference clock reference code reference collection reference company reference composition reference compound reference compounds reference conditions reference contact reference content reference control reference could reference count reference counting reference currency reference current reference curve reference customers reference data reference database reference databases reference date reference dates reference description reference design reference designs reference desk reference device reference direction reference distance reference document reference documentation reference documents reference does reference does not reference dose reference drug reference earnings reference electrode reference electrodes reference element reference elements reference entity reference example reference examples reference field