APA
Microsoft Corporation, . (1991). Microsoft FORTRAN reference version 5.1 for MS OS/2 and MS-DOS operating systems. United States: Microsoft Corporation.
Chicago
Microsoft Corporation, . 1991. Microsoft FORTRAN reference version 5.1 for MS OS/2 and MS-DOS operating systems. United States: Microsoft Corporation.
Harvard
Microsoft Corporation, . (1991). Microsoft FORTRAN reference version 5.1 for MS OS/2 and MS-DOS operating systems. United States: Microsoft Corporation.
MLA
Microsoft Corporation, . Microsoft FORTRAN reference version 5.1 for MS OS/2 and MS-DOS operating systems. United States: Microsoft Corporation. 1991.