APA-ийн эшлэл(7 дахь хэвлэлт)
HARTKE, E. J. (1986). Environmental Geologic Considerations in Koontz Lake, Starke County, Indiana, and Its 6-Mile Fringe. State of Indiana, Dep. of Natural Resources, Geological Survey.
Чикаго-гийн эшлэл (17 дахь хэвлэлт)
HARTKE, Edwin J. Environmental Geologic Considerations in Koontz Lake, Starke County, Indiana, and Its 6-Mile Fringe. Bloomington, Indiana: State of Indiana, Dep. of Natural Resources, Geological Survey, 1986.
MLA -ийн эшлэл (9 дэх хэвлэлт)
HARTKE, Edwin J. Environmental Geologic Considerations in Koontz Lake, Starke County, Indiana, and Its 6-Mile Fringe. State of Indiana, Dep. of Natural Resources, Geological Survey, 1986.
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