[Snapshot14w25a]Book

/give @p minecraft:written_book 1 0 {pages:["{text:\"\",extra:[{text:\"Say\",clickEvent:{action:run_command,value:\"/say 123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890 \"}}]}"]}

/give @p minecraft:written_book 1 0 {
	pages:[
		"{
			text:\"\",
			extra:[
				{
					text:\"Say\",
					clickEvent:{
						action:run_command,
						value:\"/say 123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890 \"
					}
				}
			]
		}"
	]
}