A basis for executing PASCAL programmers. - Henry F. Ledgard; Andrew Singer; Jon F. Hueras (ACM SIGPLAN Notices, 1977)

The Natural Language of Interactive Systems. - Henry F. Ledgard; John A. Whiteside; Andrew Singer; William Seymour (Commun. ACM, 1980)

Directions in Human Factors for Interactive Systems - Henry F. Ledgard; Andrew Singer; John A. Whiteside (Springer, 1981)

The Annotated Assistant: A Step Towards Human Engineering. - Andrew Singer; Henry F. Ledgard; Jon F. Hueras (IEEE Trans. Software Eng., 1981)

Scaling Down Ada (Or Towards A Standard Ada Subset). - Henry F. Ledgard; Andrew Singer (Commun. ACM, 1982)

Tangible Progress: Less is More in Somewire Audio Spaces. - Andrew Singer; Debby Hindus; Lisa Stifelman; Sean White (CHI, 1999)