Here is an oldie but goodie..dedicated to APA in its day with standard of the day. free to read online or download, should be updated by todays pros. still some advise ect in there
http://archive.org/stream/historyofsussexf00brat#page/n51/mode/2up
http://archive.org/stream/historyofsussexf00brat#page/n51/mode/2up