(1969). Steps to spoken english: A graded course for spanish-speaking students. Longman.
Chicago-čujuhus (17. p.)Steps to Spoken English: A Graded Course for Spanish-speaking Students. London: Longman, 1969.
MLA-čujuhus (9. p.)Steps to Spoken English: A Graded Course for Spanish-speaking Students. Longman, 1969.
Muitte dárkkistit čujuhemiid riektatvuođa, ovdal go geavahat daid iežat deavsttas.