Ludwig Heck (English Wikipedia)

Analysis of information sources in references of the Wikipedia article "Ludwig Heck" in English language version.

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apa.org

Yerkes, Robert M. (1911). "Brehm's Tierleben". Journal of Animal Behavior. 1 (4): 307–308. doi:10.1037/h0072619. ISSN 0095-9928.

Haltenorth, Theodor (1969). "Heck, Ludwig Franz Friedrich Georg". Neue Deutsche Biographie. Vol. 8. pp. 175–176.

Yerkes, Robert M. (1911). "Brehm's Tierleben". Journal of Animal Behavior. 1 (4): 307–308. doi:10.1037/h0072619. ISSN 0095-9928.

Yerkes, Robert M. (1911). "Brehm's Tierleben". Journal of Animal Behavior. 1 (4): 307–308. doi:10.1037/h0072619. ISSN 0095-9928.

Ohnesorge, Kurt (1954). "Ludwig Heck, 1860-1951" (PDF). Zeitschrift für Säugetierkunde (in German). 19: 48–56.