graph poems {
  node [shape=box];
  
  // Poem names.
  tree [label="A Poison Tree"];
  senn [label="Destruction of Sennacherib"];
  prel [label="Extract from 'The Prelude'"];
  man  [label="The Man He Killed"];
  kate [label="Cousin Kate"];
  half [label="Half-caste"];
  expo [label="Exposure"];
  chrg [label="The Charge of the Light Brigade"];
  cat  [label="Catrin"];
  tog  [label="War Photographer"];
  belf [label="Belfast Confetti"];
  game [label="The Class Game"];
  pops [label="Poppies"];
  np   [label="No Problem"];
  what [label="What Were They Like?"];
  
  // Dummy connections
  tree -- senn -- prel -- man -- kate -- half -- expo -- chrg;
  chrg -- cat -- tog -- belf -- game -- pops -- np -- what -- tree;
}
graph poems {
  overlap=false;
  node [shape=box style=rounded];
  
  // Node definitions (poems).
  tree [label=<A Poison Tree<br/>William Blake (1794)>];
  senn [label=<Destruction of Sennacherib<br/>Lord Byron (1815)>];
  prel [label=<Extract from "The Prelude"<br/>William Wordsworth (1850)>];
  man  [label=<The Man He Killed<br/>Thomas Kardy (1902)>];
  kate [label=<Cousin Kate<br/>Christina Rosetti (1860)>];
  half [label=<Half-caste<br/>John Agard (1996)>];
  expo [label=<Exposure<br/>Wilfred Owen (1917)>];
  chrg [label=<The Charge of the Light Brigade<br/>Alfred, Lord Tennyson (1854)>];
  cat  [label=<Catrin<br/>Gillian Clarke (1978)>];
  tog  [label=<War Photographer<br/>Carole Satyamurti (1987)>];
  belf [label=<Belfast Confetti<br/>Ciaran Carson (1990)>];
  game [label=<The Class Game<br/>Mary Casey (1981)>];
  pops [label=<Poppies<br/>Jane Weir (2005)>];
  np   [label=<No Problem<br/>Benjamin Zephaniah (1996)>];
  what [label=<What Were They Like?<br/>Denise Levertov (1967)>];
}