.
BATMAN FAMILY 18 and 20, July and Nov 1978, both with Starlin 2-page wraparound covers.
https://viewcomiconline.com/batman-family-v1-18/
https://viewcomiconline.com/batman-family-v1-20/

Starlin/Russell interior art (a two-part story) in DETECTIVE COMICS 481 and 482, Jan and March 1979, among nice work by O'Neil, Wein, Rogers, Golden, Giordano and others in these issues. Starlin wraparound cover also on 481.
https://viewcomiconline.com/detective-comics-v1-0481/
https://viewcomiconline.com/detective-comics-v1-0482/

[Linked Image from milehighcomics.com]

Starlin cover for DETECTIVE COMICS 503, June 1981. Interior art by Don Newton.
Starlin cover also on DETECTIVE COMICS 504, July 1981.

Much later, Starlin cover and interior art also in BATMAN 402, Dec 1986
https://viewcomiconline.com/batman-v1-402/
Starlin also scripted stories after in 414-430, drawn by Aparo and other artists, culminating in "A Death In the Family", killing off Robin (Jason Todd) in BATMAN 426-429, Dec 1988-Mar 1989.
https://viewcomiconline.com/batman-v1-426/