APA

Engstrand L., Graham D. Y., Block M., Frank U., Löfman C. O. & E. Sparre Medical AB. (1997). Ulcus i nytt ljus. Stockholm: Sparre Medical AB.

Chicago

Engstrand Lars, Graham David Y, Block Mats, Frank Urban, Löfman Carl O and E. Sparre Medical AB. 1997. Ulcus i nytt ljus. Stockholm: Sparre Medical AB.

Harvard

Engstrand L., Graham D. Y., Block M., Frank U., Löfman C. O. and E. Sparre Medical AB. (1997). Ulcus i nytt ljus. Stockholm: Sparre Medical AB.

MLA

Engstrand Lars, Graham David Y, Block Mats, Frank Urban, Löfman Carl O and E. Sparre Medical AB. Ulcus i nytt ljus. Stockholm: Sparre Medical AB. 1997.