APA Citation

Winkler, L. Pennsylvania astronomy and astrology: The Gruber-Baer era.

Chicago Style Citation

Winkler, Louis. Pennsylvania Astronomy and Astrology: The Gruber-Baer Era.

MLA Citation

Winkler, Louis. Pennsylvania Astronomy and Astrology: The Gruber-Baer Era.

Warning: These citations may not always be 100% accurate.