Text ( visual ) : unmediated Looking ahead to teaching : an introduction to the profession. -- Boston : Allyn & Bacon : Prentice-Hall , 1959. -- 403 p. : ill. ; 24 cm. -- (BA24016701) ; https://ci.nii.ac.jp/ncid/BA24016701 Author Heading(s): Van Dalen, Deobold B. ; Brittell, Robert Wendell. -- Classification(s): DC18 : 370.973. -- Subject Heading(s): LCSH : Teaching