<dependency>
  <groupId>com.liferay</groupId>
  <artifactId>com.liferay.external.reference.api</artifactId>
  <version>3.1.1</version>
</dependency>

implementation 'com.liferay:com.liferay.external.reference.api:3.1.1'

implementation("com.liferay:com.liferay.external.reference.api:3.1.1")

libraryDependencies += "com.liferay" % "com.liferay.external.reference.api" % "3.1.1"

@Grapes(
  @Grab(group='com.liferay', module='com.liferay.external.reference.api', version='3.1.1')
)

<dependency org="com.liferay" name="com.liferay.external.reference.api" rev="3.1.1" />

[com.liferay/com.liferay.external.reference.api "3.1.1"]

'com.liferay:com.liferay.external.reference.api:jar:3.1.1'