extract vs reference

extract

verb
  • To take by selection; to choose out; to cite or quote, as a passage from a book. 

  • To select parts of a whole 

  • To determine (a root of a number). 

  • To draw out; to pull out; to remove forcibly from a fixed position, as by traction or suction, etc. 

  • To withdraw by expression, distillation, or other mechanical or chemical process. Compare abstract (transitive verb). 

noun
  • A decoction, solution, or infusion made by drawing out from any substance that which gives it its essential and characteristic virtue 

  • Something that is extracted or drawn out. 

  • Ancestry; descent. 

  • A draft or copy of writing; a certified copy of the proceedings in an action and the judgment therein, with an order for execution. 

  • Any substance extracted is such a way, and characteristic of that from which it is obtained 

  • A solid preparation obtained by evaporating a solution of a drug, etc., or the fresh juice of a plant (distinguished from an abstract). 

  • A portion of a book or document, incorporated distinctly in another work; a citation; a quotation. 

reference

verb
  • To mention, to cite. 

  • To provide a list of references for (a text). 

  • To refer to, to use as a reference. 

  • To contain the value that is a memory address of some value stored in memory. 

noun
  • A measurement one can compare (some other measurement) to. 

  • Information about a person, provided by someone (a referee) with whom they are well acquainted. 

  • The act of referring: a submitting for information or decision. 

  • A previously published written work thus indicated; a source. 

  • A special sequence used to represent complex characters in markup languages, such as ™ for the ™ symbol. 

  • A relation between objects in which one object designates, or acts as a means by which to connect to or link to, another object. 

  • An object containing information which refers to data stored elsewhere, as opposed to containing the data itself. 

  • A person who provides this information; a referee. 

  • A short written identification of a previously published work which is used as a source for a text. 

  • A reference work. 

How often have the words extract and reference occurred in a corpus of books? (source: Google Ngram Viewer )