Lautzenheiser, T. (1999). Essential Elements 2000 F Horn Book 1. Hal-Leonard Corporatión.
Chicago-čujuhus (17. p.)Lautzenheiser, Tim. Essential Elements 2000 F Horn Book 1. Milwaukee: Hal-Leonard Corporatión, 1999.
MLA-čujuhus (9. p.)Lautzenheiser, Tim. Essential Elements 2000 F Horn Book 1. Hal-Leonard Corporatión, 1999.
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