Misc: What are noctilucent, cirrus, and cirrostratus categories of?

Questions

Which type of reference book summerises items of general knowledge listed in alphabetical order?

Which author created the detectives Miss Marple and Hercule Poirot?

According to the nursery rhyme, who killed Cock Robin?

What are the seed-bearing fruits of pine,cedar and fir trees called?

Which birds are kept in lofts and are used for racing?