Allen, M., Gillespie, R., & Hayes, P. T. (1994). Essential elements for strings: A comprehensive string method. Hal Leonard.
Chicago-čujuhus (17. p.)Allen, Michael, Robert Gillespie, juo Pamela Tellejohn Hayes. Essential Elements for Strings: A Comprehensive String Method. Milwaukee: Hal Leonard, 1994.
MLA-čujuhus (9. p.)Allen, Michael, et al. Essential Elements for Strings: A Comprehensive String Method. Hal Leonard, 1994.
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