APA (7th ed.) Citation

Wielen, R., Lenhardt, H., Schwan, H., & Dettbarn, C. (1999). The combination of ground-based astrometric compilation catalogues with the HIPPARCOS catalogue: I. Single-star mode. Astronomy and astrophysics, 347(?), .

Chicago Style (17th ed.) Citation

Wielen, Roland, Helmut Lenhardt, Heiner Schwan, and Christian Dettbarn. "The Combination of Ground-based Astrometric Compilation Catalogues with the HIPPARCOS Catalogue: I. Single-star Mode." Astronomy and Astrophysics 347, no. ? (1999).

MLA (9th ed.) Citation

Wielen, Roland, et al. "The Combination of Ground-based Astrometric Compilation Catalogues with the HIPPARCOS Catalogue: I. Single-star Mode." Astronomy and Astrophysics, vol. 347, no. ?, 1999.