APA

ERNESTO KOEHLER - JOHN WUMMER, .KOEHLER: 15 EASY STUDIES OPUS 33 (BOOK I OF THE PROGRESS IN FLUTE PLAYING). New York: INTERNATIONAL MUSIC COMPANY.

Chicago

ERNESTO KOEHLER - JOHN WUMMER, .KOEHLER: 15 EASY STUDIES OPUS 33 (BOOK I OF THE PROGRESS IN FLUTE PLAYING). New York: INTERNATIONAL MUSIC COMPANY.

Harvard

ERNESTO KOEHLER - JOHN WUMMER, .KOEHLER: 15 EASY STUDIES OPUS 33 (BOOK I OF THE PROGRESS IN FLUTE PLAYING). New York: INTERNATIONAL MUSIC COMPANY.

MLA

ERNESTO KOEHLER - JOHN WUMMER, .New York: INTERNATIONAL MUSIC COMPANY. .