Allen, A. F. (1920). An introduction to chemical engineering: An elementary textbook for the use of students and users of chemical machinery. Sir Isaac Pitman and Sons Ltd.
Chicago-čujuhus (17. p.)Allen, Alfred Frederick. An Introduction to Chemical Engineering: An Elementary Textbook for the Use of Students and Users of Chemical Machinery. Londres: Sir Isaac Pitman and Sons Ltd, 1920.
MLA-čujuhus (9. p.)Allen, Alfred Frederick. An Introduction to Chemical Engineering: An Elementary Textbook for the Use of Students and Users of Chemical Machinery. Sir Isaac Pitman and Sons Ltd, 1920.
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